Question: Under what conditions will the Mobile Equipment (ME) inform the Universal Integrated Circuit Card (UICC) about a change in its current Closed Access Group (CAG) cell selection status?
Option 1: When the ME detects a change in CAG cell selection status, CAG information list, or human-readable network name per CAG ID, and if the CAG Cell Selection event is part of the current event list.
Option 2: Automatically at regular intervals, regardless of changes in CAG cell selection status or the event list configuration.
Option 3: Only when the UICC explicitly requests an update on the CAG cell selection status using a GET STATUS MESSAGE command.
Option 4: When the ME powers on or restarts, to synchronize CAG information with the UICC.
Explanation: This is correct because the ME informs the UICC about a change in its current CAG cell selection status when two conditions are met: a detected change in CAG cell selection status, the CAG information list, or human-readable network name per CAG ID; and the CAG Cell Selection event being included in the current event list. This ensures the UICC stays updated on relevant changes while adhering to configured event monitoring settings.