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Which answer is consistent with Rule 28 — Vessels Constrained by Their Draught?
A
Rule 27 prescribes lights for NUC and RAM vessels.
B
White over red all-round lights at masthead when on duty.
C
Anchored vessels show an all-round white light forward and another aft (lower). Vessels aground additionally show two red all-round lights.
D
Rule 28 allows a vessel constrained by her draught to additionally exhibit three all round red lights in a vertical line, or a cylinder as a day shape, in addition to the lights prescribed for power driven vessels in Rule 23.