Which statement is TRUE concerning the danger signal?().

题目
单选题
Which statement is TRUE concerning the danger signal?().
A

When any vessel fails to understand the intentions of an approaching vessel she must sound the danger signal

B

Only the stand-on vessel can sound the danger signal

C

Distress signals may be used in place of the danger signal

D

The danger signal consists of 4 or more short blasts of the whistle

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