Question: What is a key aspect of a base station certificate signed by an operator's Registration Authority/Certification Authority (RA/CA) in the context of Network Domain Security (NDS) and Authentication Framework (AF)?
Option 1: It must strictly adhere to standard certificate profile requirements without exceptions for different deployment scenarios.
Option 2: Its profile may vary based on the intended usage and deployment scenario, potentially differing from standard certificate profiles.
Option 3: The certificate's validity is solely determined by the operator's internal security policies, not referencing any standardized certificate profiles.
Option 4: It is not signed by an RA/CA but instead uses a self-signed approach for base station authentication.
Explanation: This option correctly reflects that while base station certificates are based on standard profile requirements, their exact profile can depend on the intended deployment scenario, acknowledging flexibility in certificate profiling based on usage and scenario, crucial for implementing secure and scenario-appropriate authentication frameworks in telecom networks.