Question: What action does the AMF take if a UE-initiated de-registration request indicates that the procedure is for non-3GPP access and there is an MA PDU session with user plane resources established on both 3GPP access and non-3GPP access?
Option 1: The AMF triggers SMF to perform a local release of the PDU session(s) established over 3GPP access.
Option 2: The AMF triggers SMF to perform release of user plane resources on 3GPP access.
Option 3: The AMF triggers SMF to perform release of user plane resources on non-3GPP access, and the UE considers the user plane resources on non-3GPP access as released.
Option 4: The AMF does not take any action regarding the MA PDU session.
Explanation: When a UE-initiated de-registration request indicates that the procedure is for non-3GPP access and there is an MA PDU session with user plane resources established on both 3GPP access and non-3GPP access, the AMF triggers SMF to perform release of user plane resources on non-3GPP access. This ensures that the UE considers the user plane resources on non-3GPP access as released, maintaining consistency in resource management across different access types.