How often should an emergency operations plan be audited?

How often should an emergency operations plan be audited?
A . At least annually. Evaluations should occur after drills, emergencies, personnel changes, facility design changes and policy changes.
B. At least quarterly. Evaluations should occur after drills, emergencies, personnel changes, facility design changes and policy changes.
C. On demand. Evaluations should occur after drills, emergencies, personnel changes, facility design changes and policy changes.
D. Periodically. Evaluations should occur after drills, emergencies, personnel changes, facility design changes and policy changes.

Answer: A