Which radio call-in plan is the most prudent?

A
There must be a designated responsible person who will be available to receive your call at anytime.
B
There must be specific instructions for the designated responsible person to follow if your call does not come inon schedule.
C
The designated responsible person must be instructed to call the Coast Guard search and rescue authorities immediately ifyour call does not come in on schedule.
D
The designated responsible person should be over 18 years ofage.
E