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According to Rule 23 — Power-driven Vessels Underway, which statement is correct?
A
Every vessel shall use all available means to determine if risk of collision exists.
B
Second masthead light must be higher than the forward one.
C
If there is any doubt, such risk shall be deemed to exist.
D
Any action to avoid collision shall be positive, made in ample time, and with due regard to good seamanship.