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Under Rule 12 — Sailing Vessels, what should a navigator remember?
A
5 or more rapid blasts are the doubt or danger signal.
B
Underway but stopped: 2 prolonged in succession every 2 minutes.
C
If necessary to attract attention, a vessel may make light or sound signals that cannot be mistaken for any prescribed signal.
D
Rule 12 governs the interaction between two sailing vessels.