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 operations involving the movement of oil or oily mixtures, including bilge water discharges, cargo loading, and internal transfers, be recorded. These entries must be detailed on a tank-to-tank basis to provide a clear audit trail of all oil movements for environmental compliance.