Question: What action does the AMF take towards the SMF when a UE-initiated de-registration procedure is completed for 5GS services over 3GPP access?
Option 1: The AMF triggers the SMF to establish new PDU sessions.
Option 2: The AMF triggers the SMF to perform a local release of the PDU session(s) established over 3GPP access, if any.
Option 3: The AMF sends a notification to the SMF about the de-registration procedure completion.
Option 4: The AMF does not take any action towards the SMF.
Explanation: According to the 3GPP TS 24.501 specification, when a UE-initiated de-registration procedure is completed for 5GS services over 3GPP access, the AMF triggers the SMF to perform a local release of the PDU session(s) established over 3GPP access, if any. This action ensures that resources are released and sessions are properly terminated after the de-registration procedure.