Final answer:
RECAD requires real estate agencies to have a written disclosure office policy, which is mandatory to ensure transparent agency relationships and responsibilities.
Step-by-step explanation:
According to RECAD (Real Estate Council of Alberta), having a written agency disclosure office policy is mandatory. This policy is an essential part of ensuring transparency in real estate transactions, and serves as a guide for agency relationships between brokers, agents, and their clients. It is crucial for maintaining clarity regarding the rights and responsibilities of all parties involved.