单选题Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）AWhen at anchor，the pilot vessel is only required to sound anchor signalsBThe identification signal must be sounded any time the pilot vessel is underwayCThe pilot vessel may only sound the identity signal when making wayDAll of the above
单选题
Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）
A
When at anchor，the pilot vessel is only required to sound anchor signals
B
The identification signal must be sounded any time the pilot vessel is underway
C
The pilot vessel may only sound the identity signal when making way
D
All of the above
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