Question: In which modes can the User Equipment (UE) initiate the transport of user data via the control plane procedure?
Option 1: Only when the UE is in EMM-CONNECTED mode.
Option 2: Only when the UE is in EMM-IDLE mode.
Option 3: Both EMM-CONNECTED and EMM-IDLE modes, but with different procedures.
Option 4: Neither EMM-CONNECTED nor EMM-IDLE modes.
Explanation: The transport of user data via the control plane procedure can be initiated by the UE in both EMM-CONNECTED mode and EMM-IDLE mode. However, when the UE is in EMM-IDLE mode, it must include the ESM DATA TRANSPORT message in a CONTROL PLANE SERVICE REQUEST message to initiate the procedure.