Question: When should the UE include the specific IE in the NAS message?
Option 1: When the PDU session ID IE is included and the Payload container IE contains the PDU SESSION ESTABLISHMENT REQUEST or PDU SESSION MODIFICATION REQUEST not initiated for a change of 3GPP PS data off UE status.
Option 2: When the PDU session ID IE is not included in the NAS message.
Option 3: When the Payload container IE does not contain any PDU session-related messages.
Option 4: When the UE is in idle mode and receives a paging request from the network.
Explanation: The correct answer is Option 1 because, according to the specification, the UE should include this specific IE when two conditions are met: (1) the PDU session ID IE is included, and (2) the Payload container IE contains either a PDU SESSION ESTABLISHMENT REQUEST or a PDU SESSION MODIFICATION REQUEST that is not initiated for changing the 3GPP PS data off UE status associated with a PDU session.