What is meant by the phrase "partial flooding with boundaries intact"?

Correct Answer: Option D — The compartment is partially filled, and both the decks and bulkheads remain watertight.

Partial flooding with boundaries intact refers to a condition where a compartment is partially filled with water, but the surrounding bulkheads and decks remain watertight. This state is critical for stability calculations, as the free surface effect of the liquid significantly reduces the vessel's metacentric height and overall stability.