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According to Rule 12 — Sailing Vessels, which statement is correct?
A
Not just a literal whistle — any Annex III compliant horn, siren or foghorn qualifies.
B
When two sailing vessels approach, the one with wind on port side keeps clear.
C
Gong's tone must NOT be confusable with the bell's.
D
One short blast means starboard, two means port, three means astern propulsion, and five or more rapid blasts mean doubt or danger.