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According to Rule 21 — Definitions (Lights), which statement is correct?
A
Does not exempt from the fundamental rules of navigation.
B
Defines masthead light, sidelights, sternlight, towing light, all-round light and flashing light.
C
They apply to all vessels upon the high seas and in all waters connected therewith that are navigable by seagoing vessels.
D
Departure from rules is permitted to avoid immediate danger.