Question: What is a potential implication of introducing access dependence in network configurations for GBA_Digest bootstrapping, as per operator discretion?
Option 1: Enhanced security for all access types through standardized 3GPP ports.
Option 2: Mandatory requirement for UE to support multiple IP addresses.
Option 3: Simplified BSF (Bootstrapping Server Function) architecture with reduced port management.
Option 4: Restriction of GBA_Digest usage to specific access networks defined by the operator.
Explanation: Introducing access dependence allows operators to control over which access networks GBA_Digest can be used, effectively restricting its usage to specific networks as defined by the operator's network configuration (e.g., through assigning different ports on the BSF for different access networks). This ensures a level of access network specificity that deviates from the principle of access independence inherent in the bootstrapping procedure.