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Which option best reflects Rule 27 — Vessels Not Under Command or Restricted in Ability to Manoeuvre?
A
NUC: two red all-round lights vertically (day: two balls).
B
A vessel not under command, restricted in her ability to manoeuvre, constrained by draught, sailing, engaged in fishing, or towing/pushing another vessel sounds one prolonged followed by two short blasts at intervals of not more than 2 minutes.
C
Must not be mistakable for a prescribed signal or navigation aid.
D
Distress signals must only be used when assistance is genuinely required.