The greatest risk associated with storing customer data on a web server is data confidentiality. Data confidentiality is the property that ensures that data are accessible only to authorized entities or individuals, and protected from unauthorized disclosure or exposure. Storing customer data on a web server poses a high risk to data confidentiality, as web servers are exposed to the internet and may be vulnerable to various types of attacks or breaches that can compromise the security and privacy of customer data, such as hacking, phishing, malware, denial of service (DoS), etc. Customer data may contain sensitive or personal information that can cause harm or damage to customers or the organization if disclosed or exposed, such as identity theft, fraud, reputation loss, legal liability, etc. Data availability is the property that ensures that data are accessible and usable by authorized entities or individuals when needed. Data availability is a risk associated with storing customer data on a web server, as web servers may experience failures or disruptions that can affect the accessibility and usability of customer data, such as hardware faults, network issues, power outages, etc. However, data availability is not the greatest risk associated with storing customer data on a web server, as it does not affect the security and privacy of customer data. Data integrity is the property that ensures that data are accurate and consistent, and protected from unauthorized modification or corruption. Data integrity is a risk associated with storing customer data on a web server, as web servers may be subject to attacks or errors that can affect the accuracy and consistency of customer data, such as injection attacks, tampering, replication issues, etc. However, data integrity is not the greatest risk associated with storing customer data on a web server, as it does not affect the security and privacy of customer data. Data redundancy is the condition of having duplicate or unnecessary data in a database or system. Data redundancy is not a risk associated with storing customer data on a web server, but rather a result of poor database design or management.

Information systems governance is the set of policies, processes, structures, and practices that ensure the alignment of IT with business objectives, the delivery of value from IT investments, the management of IT risks, and the optimization of IT resources1. Information systems governance is a strategic and high-level function that covers the entire organization and its IT portfolio. Therefore, an IS auditor should review the aspects of information systems governance that are relevant to the organization's vision, mission, goals, and strategies.

One of the aspects that an IS auditor should review when evaluating information systems governance for a large organization is the approval processes for new system implementations.This is because new system implementations are significant IT investments that require careful planning, analysis, design, development, testing, deployment, and evaluation to ensure that they meet the business requirements, deliver the expected benefits, comply with the relevant standards and regulations, and minimize the potential risks2.The approval processes for new system implementations should involve the appropriate stakeholders, such as senior management, business owners, IT managers, project managers, users, and auditors, who have the authority and responsibility to approve or reject the proposed system implementations based on predefined criteria and metrics3.The approval processes for new system implementations should also be documented, transparent, consistent, and timely to ensure accountability and traceability4. Therefore, an IS auditor should review the approval processes for new system implementations to assess whether they are aligned with the information systems governance framework and objectives.

The other possible options are:

Procedures for adding a new user to the invoice processing system: This is an operational task that involves granting access rights and permissions to a specific user for a specific system based on the principle of least privilege. This is not a strategic or high-level function that falls under information systems governance. Therefore, an IS auditor should not review this aspect when evaluating information systems governance for a large organization.

Approval processes for updating the corporate website: This is a tactical task that involves making changes or enhancements to the content or design of the corporate website based on the business needs and feedback. This is not a strategic or high-level function that falls under information systems governance. Therefore, an IS auditor should not review this aspect when evaluating information systems governance for a large organization.

Procedures for regression testing system changes: This is a technical task that involves verifying that existing system functionalities are not adversely affected by new system changes or updates. This is not a strategic or high-level function that falls under information systems governance.Therefore, an IS auditor should not review this aspect when evaluating information systems governance for a large organization.References:1: What is IT Governance?- Definition from Techopedia2: System Implementation - an overview | ScienceDirect Topics3: Project Approval Process - Project Management Knowledge4: 5 Best Practices For A Successful Project Approval Process | Kissflow Project : Principle of Least Privilege (POLP) | Imperva : How to Update Your Website Content - 7 Step Guide | HostGator Blog : What Is Regression Testing? Definition & Best Practices | BrowserStack

The most important thing for an IS auditor to look for in a project feasibility study is an assessment of whether the expected benefits can be achieved. A project feasibility study is a preliminary analysis that evaluates the viability and suitability of a proposed project based on various criteria, such as technical, economic, legal, operational, and social factors. The expected benefits are the positive outcomes and value that the project aims to deliver to the organization and its stakeholders. The IS auditor should verify whether the project feasibility study has clearly defined and quantified the expected benefits, and whether it has assessed the likelihood and feasibility of achieving them within the project scope, budget, schedule, and quality parameters.The other options are also important for an IS auditor to look for in a project feasibility study, but not as important as an assessment of whether the expected benefits can be achieved, because they either focus on specific aspects of the project rather than the overall value proposition, or they assume that the project will be implemented rather than evaluating its viability.References:CISA Review Manual (Digital Version)1, Chapter 4, Section 4.2.1

The best way to help ensure new IT implementations align with enterprise architecture (EA) principles and requirements is to conduct EA reviews as part of the change advisory board (CAB). A CAB is a committee that evaluates and authorizes changes to IT services, such as new IT implementations. By conducting EA reviews as part of the CAB process, the organization can ensure that the proposed changes are consistent with the EA vision, goals, standards, and guidelines. This can help avoid potential conflicts, risks, or inefficiencies that may arise from misaligned IT implementations. Additionally, EA reviews can help identify opportunities for improvement, optimization, or innovation in the IT services.

The other options are not the best ways to help ensure new IT implementations align with EA principles and requirements. Documenting the security view as part of the EA is important, but it does not guarantee that new IT implementations will follow the security requirements or best practices. Considering stakeholder concerns when defining the EA is also essential, but it does not ensure that new IT implementations will meet the stakeholder expectations or needs. Performing mandatory post-implementation reviews of IT implementations is a good practice, but it does not prevent potential issues or problems that may arise from misaligned IT implementations.

References:

5: Change Advisory Board Best Practices: 15+ Industry Leaders Weigh In

6: What Does the Change Advisory Board (CAB) Do?

7: How do I set up an effective change advisory board? - ServiceNow

8: ITIL Change Management - The Role of the Change Advisory Board