What, According to the National Association of Realtors (NAR) Code

What, according to the National Association of Realtors (NAR) Code of Ethics, what is the primary obligation of real estate agents and brokers?

A) to protect and promote the interests of their clients
B) to be willing to present evidence and appear to answer questions when charged with unethical behavior
C) to not knowingly break the law
D) to be honest and truthful, not only to their client, but to all stakeholders involved in a real estate transaction
E) to ensure that all agreements are written in understandable language