7-34E1 D
 What is the fundamental purpose for imposing radio silence?
A. To ensure that interference to proprietary communications is minimized.
B. To ensure that only voice communications can be effected on the Distress frequency or channel.
C. To ensure that a Distressed vessel will have a "window" twice each hour for transmitting routine messages.
D. To mitigate the risk of interference on a frequency or channel being used for emergency communications.
