Question: What triggers the increment of the EFCC (Change Counter) in a Universal Subscriber Identity Module (USIM) application?
Option 1: Receipt of a new SMS message
Option 2: Update, deletion, or addition of a phone book entry
Option 3: Change in network location from one cell to another
Option 4: Periodic synchronization with the network for security updates
Explanation: The EFCC (Change Counter) is incremented by the terminal in response to any update, deletion of an existing entry, or the addition of a new entry to the phone book, ensuring synchronization and consistency of the phone book entries.