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Which answer is consistent with Rule 5 — Look-out?
A
One short blast means starboard, two means port, three means astern propulsion, and five or more rapid blasts mean doubt or danger.
B
A proper look out is not just "someone on the bridge".
C
In restricted visibility, power-driven vessels making way sound one prolonged blast every 2 minutes.
D
The last vessel of a tow, if manned, shall where practicable sound one prolonged followed by three short blasts.