Question: In a Bootstrapping Mode for GBA (Generic Bootstrapping Architecture) security context, how is the response parameter coded when a synchronization failure occurs?
Option 1: RES (Response) with error code indicating sync failure
Option 2: AUTS (Authentication Token) with retry instructions
Option 3: AUTS (Authentication Token) as per IMS (IP Multimedia Subsystem) Security context formatting
Option 4: GBA_U (GBA User) identifier with failure notification
Explanation: In the context of GBA Bootstrapping Mode, when a synchronization failure occurs, the response parameter is specifically coded as AUTS, following the formatting guidelines established for IMS Security contexts. This ensures consistency and interoperability across different subsystems within the telecom network, facilitating efficient error handling and potential retries in authentication processes.