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Which option best reflects Rule 33 — Equipment for Sound Signals?
A
A vessel constrained by draught may display three all-round red lights in a vertical line, or a cylinder day shape.
B
Normal navigation lights (sidelights, sternlight) when underway.
C
The anchor day shape is one black ball, exhibited forward.
D
Gong is never sounded alone: it always *follows* the bell, on vessels ≥ 100 m.