Question: Under which conditions will a Mobile Equipment (ME) perform a Generic Bootstrapping Architecture (GBA) bootstrapping procedure when receiving a REFRESH command from the UICC, in a context supporting Toolkit-initiated GBA?
Option 1: When the REFRESH command implies a File Change Notification on EFGBABP under ADF USIM or ADF ISIM, and Toolkit-initiated GBA is supported by the ME.
Option 2: For all REFRESH commands received during USIM Initialization, regardless of file changes.
Option 3: Only when the UICC explicitly requests a bootstrapping procedure in the REFRESH command, during a 3G Session Reset.
Option 4: Whenever the ME detects a change in the TERMINAL PROFILE indicating GBA support.
Explanation: This is the correct answer because the ME will perform a GBA bootstrapping procedure when it receives a REFRESH command implying a File Change Notification on EFGBABP under ADF USIM or ADF ISIM, provided Toolkit-initiated GBA is supported by the ME. This ensures both infrastructure and device are aligned in their support for the procedure.