BOTH INTERNATIONAL & INLAND Which statement is TRUE concerning a vessel of 150 meters in length, at anchor?

Correct Answer: Option A — She must show all-round white lights forward and aft.

Rule 30(a) mandates that any anchored vessel of 50 meters or more in length must exhibit an all-round white light in the forepart and a second all-round white light at or near the stern. For a 150-meter vessel, showing both forward and aft anchor lights is mandatory.