Question: In a USIM operating within a VGCS/VBS security context, what are the required conditions for the USIM to support VGCS security context operations?
Option 1: Only Service n°57 needs to be 'available'
Option 2: Both Service n°57 and Service n°64 must be 'available'
Option 3: Either Service n°57 or Service n°64 can be 'available'
Option 4: Service n°58 and Service n°65 being 'available' is sufficient
Explanation: For a USIM to support VGCS (Voice Group Call Service) security context operations, the simultaneous availability of both Service n°57 and Service n°64 is mandatory. This dual requirement ensures that all necessary security parameters for VGCS are accessible and operational within the USIM, facilitating secure group communications.