Question: What triggers the network to initiate EMM common procedures in an Evolved Packet System (EPS)?
Option 1: Receipt of a specific SMS message from the User Equipment (UE).
Option 2: Detection of a change in the UE's location area.
Option 3: Received information such as IMSI, GUTI and KSI from the UE.
Option 4: Expiration of a timer set by the network for periodic EMM procedures.
Explanation: The network initiates EMM common procedures based on received information from the UE, including IMSI (International Mobile Subscriber Identity), GUTI (Globally Unique Temporary Identifier), and KSI (Key Set Identifier). This ensures proper identification, authentication, and security mode control for the UE in the EPS.