What is meant by the term "radio silence"?

Correct Answer: Option A — Stations not directly involved with the on-going Distress communications may not transmit on the Distress frequency or channel.

Radio silence is a mandatory restriction prohibiting all stations not involved in the distress incident from transmitting on the designated distress frequency. This measure preserves the integrity of the communication link between the distressed vessel and rescue assets, preventing signal collision and ensuring critical information is received clearly.