Which signal is recognized as a distress signal?（）<br>A:Directing the beam of a searchlight at another vessel<br>B:A smoke signal giving off orange colored smoke<br>C:A whistle signal of one prolonged and three short blasts<br>D:International Code Signal "PAN" spoken over the radiotelephone

Which signal is recognized as a distress signal?（）
A:Directing the beam of a searchlight at another vessel
B:A smoke signal giving off orange colored smoke
C:A whistle signal of one prolonged and three short blasts
D:International Code Signal "PAN" spoken over the radiotelephone

出自：海船船员证

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