Question: In the UNBLOCK CHV command for the SIM-ME interface, what does Parameter P2 being set to '00' specify?
Option 1: Authentication attempt counter reset
Option 2: Selection of CHV1 for unblocking
Option 3: Indication of a permanent block
Option 4: Request for additional security credentials
Explanation: Parameter P2 set to '00' in the UNBLOCK CHV command specifies that the operation targets CHV1 for unblocking, highlighting the importance of precise parameter settings in telecom protocols for correct command execution and security.