Explanation: The determination that Distress traffic is over is made by the authorities controlling the Search and Rescue (SAR) operation. The Rescue Coordination Center (RCC) is the designated authority responsible for coordinating all SAR activities within a specific region. An On-Scene Coordinator (OSC) may be appointed by the RCC to manage operations directly at the distress site, including communications. Therefore, the RCC and/or the OSC, having overall command and control of the rescue efforts, are best positioned to know when the immediate danger has passed and SAR operations can be terminated. This ensures proper protocol and avoids premature cessation of monitoring or rescue activities. The vessel in distress (A) might be incapacitated or unable to make an objective determination. The first Coast Station (C) initiates the alert but doesn't manage the entire SAR operation. Other vessels (D) are responders but lack the authority and complete picture to make such a critical decision.