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Which answer is consistent with Rule 32 — Definitions (Sound Signals)?
A
Bell and gong may be replaced by equivalent equipment, but manual sounding must always remain possible.
B
Two or three seconds is neither: train your timing so 1 s and 4 6 s are unmistakably distinct to anyone listening.
C
5 or more rapid blasts are the doubt or danger signal.
D
Underway but stopped: 2 prolonged in succession every 2 minutes.