ENERGY STAR Portfolio Manager is an online tool developed by the U.S. Environmental Protection Agency (EPA) that allows building owners and managers to measure and track the energy and water performance of their buildings, as well as benchmark their buildings against similar buildings nationwide. The tool uses a 1-
100 ENERGY STAR score to rate the energy efficiency of a building relative to its peers, where a score of 50 represents medianperformance and a score of 75 or higher indicates top performance1 . References: LEED v4 Green Associate Candidate Handbook1, ENERGY STAR Portfolio Manager

Using graywater for hand washing is a strategy for reducing indoor water use, as it can save potable water that would otherwise be used for this purpose. Graywater is the wastewater that is generated from activities such as bathing, laundry, and dishwashing, which can be treated and reused for non-potable applications, such as toilet flushing, irrigation, and hand washing. Using graywater for hand washing can reduce the indoor water use by up to 40%, according to a study by the Pacific Institute1. LEED v4 recognizes and rewards this strategy in the Indoor Water Use Reduction credit2, which aims to reduce the potable water consumption of a building by at least 25% compared to a baseline3. The other options are not directly related to reducing indoor water use, as they involve different types of measures or systems that are not relevant for saving potable water.

The U.S. Green Building Council (USGBC) is the organization that developed and maintains the LEED Rating System. It defines the structure, intent, and requirements of LEED certification systems for various building types (e.g., BD+C, ID+C, O+M, ND, Homes).
"The LEED rating system was developed by the USGBC to provide a framework for healthy, highly efficient, and cost-saving green buildings."
- LEED v4 BD+C Reference Guide, Introduction
Clarifying the incorrect options:
* A. LEED Operations and Maintenance exam is managed by Green Business Certification Inc.
(GBCI), not USGBC.
* C. LEED Credential Maintenance Program (CMP) is also administered by GBCI.
* D. LEED User is a third-party platform maintained by BuildingGreen, not USGBC.
Correct answer: B - LEED Rating System, created and maintained by USGBC.

Recycling is a strategy that can be used during the building process and after occupation to reduce waste.
Recycling involves collecting, sorting, processing, and reusing or selling materials that would otherwise be discarded as waste. Recycling can save natural resources, reduce greenhouse gas emissions, create jobs, and lower disposal costs1 . Recycling can also help to achieveLEED credits in the Materials and Resources category by reducing the amount of construction and demolition waste generated by the project or by diverting waste from landfills or incinerators. References: LEED v4 Green Associate Candidate Handbook1, EPA's Recycling Basics2, LEED v4 BD+C Reference Guide

vocs are volatile organic compounds that can evaporate from paints, solvents, adhesives, and other building materials. They can cause health problems such as eye irritation, respiratory distress, headaches, and cancer. Limiting the concentration of vocs in the air protects the health of construction personnel by reducing their exposure to these harmful substances12.
References :=
* Occupational Hygiene - Occupational Exposure Limits | CCOHS
* 1910.1450 - Occupational exposure to hazardous chemicals in laboratories. | Occupational Safety and Health Administration