In the context of LEED AP Interior Design + Construction V4, regularly occupied spaces are areas where people spend a significant amount of time on a regular basis. Conference rooms fit this definition as they are designed for occupants to gather for extended periods for meetings and collaborative work.

For the Materials and Resources Credit, Building Product Disclosure and Optimization - Sourcing of Raw Materials, Option 2, Leadership Extraction Practices, the total cost determination of each product includes not only the materials costs but also the transportation costs and installation labor.This is because these factors contribute to the overall expense of the product from its origin to its final installed state in the project1.

LEED v4 for Interior Design and Construction Reference Guide2.

LEED Credit Library - Materials and Resources3.

LEEDuser's discussion on Building Product Disclosure and Optimization4.

The Water Efficiency Prerequisite for Indoor Water Use Reduction in LEED aims to minimize water consumption within a building through efficient plumbing fixtures and fittings. The prerequisite encompasses a range of fixtures that significantly contribute to a building's overall water usage. Urinals and showerheads are standard fixtures addressed in this prerequisite, reflecting their common use in both commercial and residential settings and their potential for water savings. Commercial kitchen pot filling faucets are also included as they can have high flow rates and thus a significant impact on water use in settings where they are used. Toilets are also a critical component of water use calculations, but pre-rinse spray valves and dishwashers are more specifically addressed in other LEED credits focusing on process water use or the Energy and Atmosphere category due to their energy implications. Reference:

LEED v4 for Interior Design and Construction Reference Guide, specifically the Water Efficiency section, which outlines the prerequisites and credits related to reducing indoor water use and includes details on applicable plumbing fixtures and fittings.

According to LEED requirements, the commissioning process is a critical part of verifying that building systems are installed and perform according to the owner's project requirements, the basis of design, and construction documents.For a PV system installed after the initial commissioning, the commissioning agent (CxA) must return to conduct or oversee the additional commissioning activities to ensure the system is integrated properly and performs as intended123.

Fundamental commissioning and verification requirements as outlined in the LEED v4 for Building Design and Construction Guide4.

The commissioning process activities for renewable energy systems, including PV systems, as described in the LEED v4.1 Certification Commissioning Guide3.

The importance of commissioning for PV systems to ensure system efficiency, safety, and ROI, as discussed in various industry resources56.

Reducing the area planned for surface parking and replacing it with additional green space can significantly increase the rainwater infiltration capacity. Green spaces allow for more rainwater to be absorbed into the ground, reducing runoff and potentially mitigating flooding. This is a sustainable strategy that can contribute to the site's water management and support LEED credits related to rainwater management.

LEED v4: Interior Design + Construction Guide1

Information on rainwater management and heat island reduction synergies2.

For LEED Indoor Environmental Quality Credit concerning Interior Lighting, Option 1, the requirement is for 90% of building occupants to have individual lighting controls. Given that the tenant space includes 100 workstations and 10 enclosed offices intended for individual use, this means that a total of 110 workspaces require lighting control. To achieve one point, at least 90% of these occupants must have control over the lighting in their space. Therefore, the minimum number of occupants that would need individual lighting controls is 90% of 110, which calculates to 99 occupants (rounded down). However, as individual controls cannot be split between occupants, the actual minimum number would be 99 occupants. Option B is the closest answer to 99 without going under the required percentage.