Explanation: The Urgency signal (PAN PAN) indicates that a mobile station has a very urgent message concerning the safety of a ship, aircraft, or person. The authority to transmit such a critical safety message rests with the highest individual responsible for the safety of that mobile unit or the people involved. For a ship, this ultimate authority is the Master. For other types of mobile stations, such as an aircraft or a land mobile station, this authority is the person responsible for the mobile station's operation and the safety of those aboard (e.g., the pilot in command of an aircraft). Therefore, option C correctly combines these roles, ensuring the Urgency signal is only initiated under the direct authority of the person accountable for the immediate safety situation. While an FCC-licensed operator transmits the signal, they do so under the authority of the Master or the person responsible for the mobile station, not on their own initiative.