Question: What is the primary purpose of including an alpha-identifier in the response data to the ENVELOPE (MO SHORT MESSAGE CONTROL) message from the UICC to the ME?
Option 1: To authenticate the user for secure messaging services
Option 2: To provide a visual indication to the user at the time the response is received by the Mobile Equipment (ME)
Option 3: To encrypt the short message content for confidentiality
Option 4: To redirect the user to a specific web page for further information
Explanation: The inclusion of an alpha-identifier in this context is primarily for notifying or alerting the user at the exact moment the Mobile Equipment (ME) receives the response, enhancing their interaction experience with immediate feedback or indicators.