Rainwater harvesting can be used for which of the following credits or prerequisites?

Rainwater harvesting can be used for which of the following credits or prerequisites?
A . Water Efficiency Credit, Water Metering
B . Water Efficiency Credit, Indoor Water Use Reduction
C . Water Efficiency Prerequisite, Indoor Water Use Reduction
D . Water Efficiency Prerequisite, Building-Level Water Metering

Answer: B

Explanation:

Rainwater harvesting is a strategy that can be used to reduce indoor water use, which is a part of the Water Efficiency Credit under the LEED AP Operations + Maintenance (LEED AP O+M) V4.1. By collecting and using rainwater for non-potable uses such as toilet flushing or irrigation, buildings can significantly reduce their demand for municipally treated water. This aligns with the goals of the Indoor Water Use Reduction credit, which encourages the reduction of potable water usage inside the building1.

Reference: LEED v4: Building Operations + Maintenance Guide