Question: In an MBMS User Service, what is the implication of setting the `validUntil` attribute for all fragments to a time in the past when signaling service deletion before its currently defined validity period?
Option 1: The UE will immediately update the service's validity information without overwriting the fragment.
Option 2: The UE will safely delete those metadata fragments and the associated MBMS User Service upon next synchronization.
Option 3: The system will automatically assign a new, future `validUntil` for all fragments to maintain service continuity.
Option 4: The MBMS client will request retransmission of all fragments for the deleted service.
Explanation: Setting the `validUntil` attribute for all fragments to a time in the past signals the deletion of the User Service before its originally defined validity period expires, instructing the UE to safely remove associated metadata fragments and delete the MBMS User Service, ensuring efficient memory management.