The term "discharge", as it applies to the pollution regulations, means __________.

Correct Answer: Option D — all of the above

33 CFR 151.05 defines "discharge" broadly to include any spilling, leaking, pumping, pouring, emitting, emptying, or dumping. This comprehensive definition ensures that any release of oil or oily mixtures, regardless of the mechanism or intent, is subject to the stringent requirements of the pollution prevention regulations.