Question: What is the purpose of including the "SMS Indication" Information Element (IE) in a message?
Option 1: To notify the network about changes in the UE's capability to use SMS over Non-Access Stratum (NAS).
Option 2: To request the network to enable or disable SMS services for the UE.
Option 3: To report the current SMS usage statistics of the UE to the network.
Option 4: To acknowledge receipt of an SMS message by the UE.
Explanation: The "SMS Indication" IE is used to inform the network about changes in the UE's ability to use SMS over NAS, ensuring that the network is aware of the UE's current capabilities and can provide appropriate services accordingly.