Explanation: SafetyNET is a global service for broadcasting Maritime Safety Information (MSI) via Inmarsat-C satellites. This service relies on the **Enhanced Group Calling (EGC) capability** of Inmarsat-C Ship Earth Stations (SES). Therefore, an Inmarsat-C SES *must* have EGC capability to receive MSI (D is correct). The EGC receiver portion of an Inmarsat-C terminal is designed to be continuously active, monitoring the satellite broadcast channel. This ensures that **unscheduled Urgency and Distress messages** (the highest priority) are always received, even if the SES is not actively logged in for routine two-way communication services (A is correct), as these messages are critical for safety and often broadcast widely. While scheduled MSI is typically targeted to specific geographical areas (NAVAREAs/METAREAs) requiring the SES to be logged in for accurate position reporting, the active EGC receiver will technically **receive the raw broadcast data stream containing both scheduled MSI and unscheduled Urgency and Distress messages** if the SES is powered on and within the satellite footprint, regardless of its login status for other services (C is correct). The terminal then filters these messages based on its configuration. Since statements A, C, and D are all accurate descriptions of SafetyNET operation and capabilities, the correct answer is B.