Question: What happens to the MBMS UE's termination procedure if it is triggered during the `protectionPeriod` signaled by the BM-SC in the MBMS User Service Description (USD)?
Option 1: The MBMS UE immediately starts its termination procedure, ignoring the `randomTimePeriod`.
Option 2: The MBMS UE defers its termination procedure to a random time within the interval specified by `randomTimePeriod`, starting from the session end time.
Option 3: The MBMS UE pauses all services for the duration of `protectionPeriod` before initiating any termination procedures.
Option 4: The MBMS UE only considers the `randomTimePeriod` if the session has not ended, otherwise, it terminates immediately.
Explanation: When the termination procedure is triggered during the `protectionPeriod`, the MBMS UE randomly spreads its termination over an interval specified by `randomTimePeriod`. This randomization avoids congestion during critical periods. Thus, the correct action involves deferring termination to a random time within the specified interval, starting after the session end time but within the protected timeframe.