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Under Rule 33 — Equipment for Sound Signals, what should a navigator remember?
A
Three red all-round lights in a vertical line.
B
Normal anchor lights when at anchor.
C
Whistle from 12 m, bell added from 20 m, gong added from 100 m — and the gong's tone must not be confused with the bell's.
D
Aground = anchor signals PLUS two red lights vertically (night) and three balls vertically (day).