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According to Rule 18 — Responsibilities Between Vessels, which statement is correct?
A
A vessel aground shall exhibit the anchor lights and shape plus two all round red lights and three balls in a vertical line.
B
Short blast = approximately 1 second.
C
12m+: whistle and bell required.
D
Rule 18 sets the basic responsibilities between vessel types. Constrained-by-draught vessels receive special consideration but are not simply another rung in a fixed hierarchy.