Explanation: SafetyNET is an international satellite-based broadcast service for the promulgation of Maritime Safety Information (MSI) to ships. It operates as part of the Global Maritime Distress and Safety System (GMDSS), specifically utilizing Inmarsat-C SafetyNET for its broadcasts. **D) MSI (Maritime Safety Information)** is correct because SafetyNET's sole purpose is to transmit crucial MSI, which includes navigational warnings, meteorological warnings and forecasts, and other urgent safety-related messages essential for safe navigation at sea. **A) Traffic Lists** are typically broadcast by coast stations to inform vessels that they have messages waiting for them, not the primary function of SafetyNET. **B) Priority Messages** is too general; while MSI often consists of high-priority information, "Priority Messages" isn't the specific term for the information SafetyNET promulgates. **C) MARAD (Maritime Administration)** is a U.S. government agency. SafetyNET is an international system, and while MARAD might contribute information, it's not the *type* of information broadcast.