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Which option best reflects Rule 32 — Definitions (Sound Signals)?
A
NUC: two red all-round lights vertically (day: two balls).
B
A vessel constrained by draught may display three all-round red lights in a vertical line, or a cylinder day shape.
C
Normal navigation lights (sidelights, sternlight) when underway.
D
Two or three seconds is neither: train your timing so 1 s and 4 6 s are unmistakably distinct to anyone listening.