BOTH INTERNATIONAL & INLAND While underway in fog, you hear the rapid ringing of a bell for about five seconds followed by the sounding of a gong for about five seconds. This signal came from a __________.

Correct Answer: Option C — vessel 150 meters in length at anchor

Rule 35(f) states that a vessel of 100 meters or more in length at anchor shall ring the bell forward for 5 seconds, followed immediately by the gong rapidly for 5 seconds aft, indicating its exact classification.