BOTH INTERNATIONAL & INLAND A tug is towing three unmanned barges astern in fog. The third vessel of the tow must take which action?

Correct Answer: Option B — No fog signal is required

Rule 35(c) dictates that only the towing vessel sounds the prescribed fog signal. Manned vessels in a tow may sound their own signals, but unmanned barges are not required to sound any fog signal. The third vessel, being unmanned, remains silent, relying on the towing vessel's sound signals.