As it pertains to a "constant-tension" mooring winch, what statement is true?

Correct Answer: Option D — A constant-tension mooring winch is set to automatically render and recover mooring line using the prime mover when the mooring line tension varies outside of narrow preset adjustable tension limits.

Constant-tension winches utilize automatic controls to maintain line tension within preset limits. The prime mover actively pays out or hauls in the line as the vessel moves relative to the pier, ensuring the mooring line remains taut without exceeding safe tension thresholds or becoming dangerously slack.