Question: Which entity/entities can trigger the decision to revoke an API invoker's authorization for accessing service APIs in a 3GPP Northbound API framework?
Option 1: Only the Application Enablement Function (AEF) within the Public Land Mobile Network (PLMN) trust domain
Option 2: Either the AEF (within PLMN or 3rd party trust domains) or the Common API Framework (CAPIF) core function, specifically in RNAA scenarios for the latter
Option 3: The CAPIF core function exclusively, based on predefined usage limits or policies
Option 4: Both the Application Enablement Function (AEF), regardless of its trust domain (PLMN or 3rd party), and the Common API Framework (CAPIF) core function, with the latter's decision potentially initiated in RNAA scenarios
Explanation: The correct answer is Option 4 because the decision to revoke an API invoker's authorization can be triggered by two entities: The Application Enablement Function (AEF), residing within either the PLMN or a 3rd party trust domain, and the Common API Framework (CAPIF) core function, particularly in RNAA scenarios, ensuring flexible management of API invoker authorizations across different trust domains and operational scenarios.