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Which option best reflects Rule 33 — Equipment for Sound Signals?
A
Navigation lights are mandatory from sunset to sunrise.
B
Defines masthead light, sidelights, sternlight, towing light, all-round light and flashing light.
C
Masthead light of large vessels must be visible at 6 miles.
D
Gong is never sounded alone: it always *follows* the bell, on vessels ≥ 100 m.