Explanation: A Distress Hot Key, common in GMDSS (Global Maritime Distress and Safety System) equipment, activates an immediate Digital Selective Calling (DSC) distress alert. This automated process is designed to transmit critical information swiftly and reliably. The fundamental data points automatically encoded and transmitted within a DSC distress alert are the unique **MMSI (Maritime Mobile Service Identity) number** of the vessel, the **vessel's position** (typically supplied by an interfaced GPS), and the inherent **distress priority** signaling an emergency. This core information enables rescue authorities to quickly identify the vessel in distress and its location. Options B, C, and D are incorrect because they either omit crucial information like the vessel's position or MMSI, or include details (such as course/speed or specific voice frequencies) that are typically part of subsequent communications, not the initial, automated DSC distress message itself.