What action should a GMDSS Radio Operator take when SafetyNETTM Distress or Urgency messages are received by the vessel's EGC receiver?

Correct Answer: Option B — Aural and visual alarms are activated, and require manual deactivation.

SafetyNET Distress and Urgency messages trigger mandatory aural and visual alarms on the EGC receiver. These alarms are designed to alert the bridge team immediately to critical safety information. Per IMO performance standards, these alarms must be manually acknowledged and deactivated by the operator to ensure the message was received.