Question: What triggers a UE to enter the state EMM-DEREGISTERED-INITIATED?
Option 1: Receipt of a detach request from the MME.
Option 2: The UE's own initiation of the detach or combined detach procedure.
Option 3: Expiration of a timer related to the EMM context.
Option 4: Failure of an authentication procedure.
Explanation: A UE enters the state EMM-DEREGISTERED-INITIATED after it has requested release of the EMM context by starting the detach or combined detach procedure, indicating that the UE's own initiation of this procedure triggers this state.