Which of the following operations aboard a tanker must be recorded in the Oil Record Book on a tank-to-tank basis according to Coast Guard Regulations?

Correct Answer: Option D — All of the above.

33 CFR 151.25 requires that all oil-related operations, including bilge water discharges, internal oil transfers, and cargo loading or unloading, be meticulously recorded in the Oil Record Book. These records must be maintained on a tank-to-tank basis to provide an accurate audit trail for Coast Guard inspections.