Question: Which message received by a terminal in an E-UTRAN/Satellite E-UTRAN network triggers the terminal to inform the UICC about a Network Rejection event using the ENVELOPE (EVENT DOWNLOAD – Network Rejection Event) command?
Option 1: LOCATION UPDATING ACCEPT message
Option 2: ROUTING AREA UPDATE REQUEST message
Option 3: GPRS ATTACH ACCEPT message
Option 4: EMM ATTACH REJECT message or TRACKING AREA UPDATE REJECT message
Explanation: In E-UTRAN and Satellite E-UTRAN networks, a Network Rejection event is triggered by specific reject messages. The EMM ATTACH REJECT message and TRACKING AREA UPDATE REJECT message prompt the terminal to notify the UICC of a Network Rejection event using the specified ENVELOPE command. Options 1, 2, and 3 are incorrect as they refer to accept messages or different network types.