What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）<br>A:No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency<br>B:The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received<br>C:The Operator should immediately set continuous watch on VHF channel 70<br>D:The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）
A:No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency
B:The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received
C:The Operator should immediately set continuous watch on VHF channel 70
D:The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

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