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Which answer is consistent with Rule 20 — Application (Lights)?
A
Rule 23 specifies lights for power driven vessels underway.
B
A power driven vessel when towing shall exhibit: Two masthead lights in a vertical line instead of the single forward masthead light.
C
Day shapes matter in daylight even when the ship's lights are also relevant.
D
A sailing vessel underway shall exhibit sidelights and a sternlight.