Question: During 3G session termination, what triggers the Mobile Equipment (ME) to start transferring subscriber-related information to the Universal Subscriber Identity Module (USIM)?
Option 1: Receipt of a DETACH request from the network
Option 2: Sending of a particular STATUS command from the ME to the USIM
Option 3: Completion of all ongoing data transfer sessions
Option 4: Expiration of a predefined inactivity timer
Explanation: The correct answer is Option 2 because, according to the procedure outlined for 3G session termination, the ME initiates the termination process by sending a specific STATUS command to the USIM, signaling the start of the termination procedure. This step precedes the transfer of subscriber-related information to the USIM, making it the triggering event.