Select the TRUE statement:

A$.$ An emergency plan is considered up$-$to$-$date if it has been reviewed at least once in the last decade.

B$.$ The best time to review and update an emergency plan is during a major activation of the plan, while personnel are focused on the policies and procedures.

C$.$ An emergency plan should be reviewed and updated at least every $1$ or $2$ years and after key events, including plan activation.

D$.$ An emergency plan only needs to be updated when there is a revision in the laws, codes, or ordinances that govern emergency planning.