How can vessel personnel detect the operation of a SART in its vicinity?（）
A unique radar signal consisting of a blip code radiating outward from a SART's position along its line of bearing
B. A unique two tone "warbling" signal heard on VHF-FM ch-70
C. A unique two tone alarm signal heard upon the automatic unmuting of the 2182 kHz radiotelephone automatic watch receiver
D. The SART signal appears as a target which comes and goes; the effect of heavy swells on the SART
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