Question: What triggers the release of an ongoing Mission Critical Video (MCVideo) group communication, based on inactivity, among participating MCVideo clients?
Option 1: Absence of any transmission to or from other communication participants for a specific duration.
Option 2: Expiration of a predefined maximum session time set by the network operator.
Option 3: Manual termination request from all participating MCVideo clients.
Option 4: Switching to a different communication mode (e.g., from video to voice).
Explanation: This is correct because, according to the defined inactivity criteria for MCVideo group communications, the absence of any transmissions (either sending or receiving) among participants for a specified duration constitutes inactivity, leading to the automatic release of the group communication, ensuring resources are efficiently managed and allocated based on active usage needs.