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Which option best reflects Rule 31 — Seaplanes?
A
The whistle, bell and gong shall comply with the specifications of Annex III.
B
Seaplanes must exhibit lights as similar as practicable to the rules.
C
A single prolonged blast warns of a blind bend or obstruction in a channel.
D
Anchor signals use the bell every minute, not the 2-minute whistle interval.