Which channel and mode should be used when initiating a distress alert transmission（）.<br>A:Channel 6 DSC<br>B:Channel 6 Radiotelephony<br>C:Channel 13 Radiotelephony and channel 16 DSC<br>D:Channel 70 DSC

Which channel and mode should be used when initiating a distress alert transmission（）.
A:Channel 6 DSC
B:Channel 6 Radiotelephony
C:Channel 13 Radiotelephony and channel 16 DSC
D:Channel 70 DSC

出自：海船船员证

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