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Which answer is consistent with Rule 31 — Seaplanes?
A
A single prolonged blast warns of a blind bend or obstruction in a channel.
B
Anchor signals use the bell every minute, not the 2-minute whistle interval.
C
Where it is impracticable for a seaplane to exhibit lights of the exact characteristics, it shall…
D
Must not be mistakable for a prescribed signal or navigation aid.