What design feature is used to minimize potable water wastage associated with hot water distribution piping for a potable water system?

Correct Answer: Option B — Use of hot water recirculation loops.

Hot water recirculation loops continuously circulate water between the heater and the furthest fixture. This design ensures that hot water is immediately available at the tap, minimizing the amount of water wasted while waiting for the temperature to rise, thereby conserving the ship's limited potable water supply.