When can routine communications be resumed when radio silence has been imposed?（）
- AAfter determining that the frequency or channel appears to be no longer in use
- BAfter determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
- CRoutine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
- DIf，in the Master's opinion，communications on that frequency will interfere with emergency communicatio