If a vessel is to be laid up for an extended period of time with minimal utilities provided from ashore, what statement is true as it relates to preparing a refrigeration system for lay-up?

Correct Answer: Option D — The refrigeration system should be pumped down so that the entire refrigerant charge is stored and isolated in the receiver tank.

Pumping down a refrigeration system involves closing the liquid line valve and running the compressor until the low-side pressure reaches a vacuum. This effectively transfers the refrigerant charge into the receiver tank, where it remains isolated and protected from contamination or leakage during extended periods of vessel lay-up.