A vessel is in compliance with federal regulations regarding the discharge of sewage by __________.

Correct Answer: Option D — all of the above

33 CFR Part 159 mandates that vessels must manage sewage through approved methods. Compliance is achieved by either holding the waste in an approved tank (Type III), treating it through an approved MSD (Type I or II), or discharging it to an authorized shore-side reception facility, making all options valid.