: Sharing people with unique skills across multiple teams will likely result in teams having to wait more often for those people to be available, impeding the delivery of value.This is because those people will have to context-switch between different teams, products, and domains, reducing their focus and efficiency1.Moreover, sharing people with unique skills will create bottlenecks and dependencies in the delivery process, increasing the risk of delays and quality issues2.Furthermore, sharing people with unique skills will discourage teams from developing deep technical skills themselves, making them less cross-functional and self-organizing3. Therefore, the best answer is A.

The other options are not correct because:

B . Teams do not have to develop deep technical skills. This is not a desirable condition, as it contradicts the Scrum value of commitment and the principle of continuous improvement.Teams should strive to develop deep technical skills to deliver high-quality products and to respond to changing requirements and technologies4.

C . Costs are lower since expensive resources are shared. This is not necessarily true, as the costs of context-switching, waiting, and quality issues may outweigh the benefits of sharing resources.Moreover, this option implies a resource-oriented mindset, rather than a value-oriented mindset, which is not aligned with the Scrum framework and the Product Owner role5.

D . More work gets done since people are better utilized. This is not a valid measure of success, as the amount of work done does not reflect the value delivered.Moreover, this option implies a utilization-oriented mindset, rather than an outcome-oriented mindset, which is not aligned with the Scrum framework and the Product Owner role.Reference:1: Context Switching,2: Bottlenecks and Dependencies,3: Cross-Functional Teams,4: Technical Excellence,5: Resource vs. Value Orientation, : Utilization vs. Outcome Orientation

The Sprint Backlog is the set of Product Backlog items selected for the Sprint, plus a plan for delivering the product Increment and realizing the Sprint Goal1.The Sprint Backlog is a forecast by the Developers about what functionality will be in the next Increment and the work needed to deliver that functionality into a ''Done'' Increment2.The Sprint Backlog is a plan with enough detail that changes in progress can be understood in the Daily Scrum2. The Developers modify the Sprint Backlog throughout the Sprint, and the Sprint Backlog emerges during the Sprint.This emergence occurs as the Developers work through the plan and learn more about the work needed to achieve the Sprint Goal2.The Sprint Backlog is not a commitment to deliver a fixed scope of work, but rather a forecast of what the Developers believe they can do in the Sprint3.Therefore, the Sprint Backlog does not need to be fully defined during the Sprint Planning, but only enough so the Developers can create a realistic forecast of what they can do during the Sprint.Reference:1: Sprint Backlog,2: The Scrum Guide,3: Commitment vs. Forecast

The Sprint Goal is a summary statement of the Sprint objective, which ideally has a cohesive theme. The Sprint Goal also gives the Scrum Team guidance and flexibility on how to achieve the objective. The Sprint Goal is crafted by the entire Scrum Team during the Sprint Planning, based on the Product Owner's proposal of the most valuable Product Backlog items and the Development Team's forecast of the work that can be done in the Sprint. The Product Owner collaborates with the team to write the Sprint Goal and defines it on the basis of the value being sought. The Product Owner does not define the scope or the solution for the Sprint, but rather the outcome and the benefit. The Product Owner also does not work with stakeholders to set the Sprint Goal, but rather represents their interests and needs. The Product Owner has a role in crafting the Sprint Goal, but not the sole responsibility for it.Reference:

Professional Scrum Product Owner II Assessment

Understanding and Applying the Scrum Framework

Managing Products with Agility

The Role of the Product Owner during the Sprint

Sprint Goal -- An Essential Ingredient in Scrum Recipe

According to the Professional Scrum Product Owner II certification guide1, the Sprint Goal is the single objective for the Sprint. It is a commitment made by the Scrum Team during Sprint Planning. The Sprint Goal provides guidance to the Developers on why it is valuable to build a coherent Increment. The Product Owner proposes how the product could increase its value and utility in the current Sprint. The whole Scrum Team then collaborates to define a Sprint Goal that communicates why the Sprint is valuable to stakeholders. The Product Owner should not dictate the Sprint Goal, but rather collaborate with the Developers and the Scrum Master to create a shared understanding and alignment.The other options are not activities that a Product Owner should never do, because they are either part of the Product Owner's accountabilities (A, C, D) or may be done in collaboration with others (A, D).Reference:1: Professional Scrum Product Owner II Certification | Scrum.org

A burndown chart is a graphical tool that shows the amount of work remaining versus time. It is often used to track the progress of a Sprint or a release. The work remaining is usually measured in terms of effort, such as hours or story points, and it is plotted on the vertical axis. The time is measured in terms of days or weeks, and it is plotted on the horizontal axis. The burndown chart starts with the total amount of work at the beginning of the Sprint or release, and it ideally ends with zero work at the end.The slope of the burndown chart indicates the rate of progress, or the velocity, of the Scrum Team12.

The other options are not what burndown charts track. Accumulated cost, accumulated business value, and individual worker productivity are not relevant or useful metrics for Scrum Teams, as they do not reflect the value or the quality of the product.Scrum Teams focus on delivering potentially releasable increments of the product that meet the Definition of Done, and they use empirical feedback to inspect and adapt their work13.Reference:1:Understanding and Applying the Scrum Framework2:Burndown Chart3:Managing Products with Agility