Question: In a 5G System, what triggers the reservation of NG-RAN resources for members of an MC (Mission Critical) group to receive multicast MBS (Multicast Broadcast Services) media?
Option 1: MB-SMF (Multicast Broadcast Session Management Function) periodically reserves resources for all affiliated MC groups.
Option 2: UE (User Equipment) session join request towards the 5GC (5th Generation Core) for each individual member of the MC group.
Option 3: MC Service Server's activation procedure, typically initiated when an MC group call (e.g., MCPTT group call) starts or ends.
Option 4: Automatic resource allocation by NG-RAN upon multicast MBS session creation, without any additional requests.
Explanation: The correct answer is Option 3 because the reservation of NG-RAN resources for MC group members to receive multicast MBS media is efficiently managed through the activation/de-activation procedure controlled by the MC Service Server. This process is ideally triggered in response to events like the start or end of an MC group call, ensuring flexible and efficient use of radio resources.