Question: What does the coding value '80' in the EFAD (Administrative Data) file indicate regarding the mode of operation for a User Equipment (UE) in an IP Multimedia Services Identity Module (ISIM) application?
Option 1: Normal operation with specific facilities activated
Option 2: Maintenance mode (offline) for proprietary auto-tests
Option 3: Type approval operations to test network equipment
Option 4: Manufacturer-specific online diagnostic mode
Explanation: The correct answer, '80', is specifically coded to indicate 'type approval operations' in the EFAD file. This mode allows for the testing of network equipment during type approval procedures, distinguishing it from normal operation, maintenance modes, or other specialized operational states.