9D45 D
 The radiotelephone silence period is:
A. A time period that the radiotelephone watch receiver can be powered off as no traffic is sent during this period.
B. A period dedicated for testing so as not to interfere with normal message traffic.
C. Used to pass message traffic on a non-interference basis.
D. A 3 minute period that is reserved for distress, urgency, or safety messages.
