Question: What is the primary purpose of the CAPIF-7e reference point in the context of 3GPP Northbound APIs, specifically when interacting between different trust domains?
Option 1: To handle security authentication for API invokers across trust domains.
Option 2: For the forwarding or routing of API invoker's service API invocation between API exposing functions.
Option 3: To manage billing and charging for API usage across different trust domains.
Option 4: To monitor and analyze performance metrics of API exposing functions.
Explanation: The correct answer, Option 2, accurately reflects the primary purpose of the CAPIF-7e reference point as described. It facilitates the forwarding or routing of service API invocations between API exposing functions that belong to different trust domains. Option 1 is incorrect because the security aspects are explicitly noted to be the responsibility of SA3, not a function of the CAPIF-7e reference point itself. Options 3 and 4 are also incorrect as they introduce functionalities (billing/charging and performance monitoring) not associated with the described purpose of CAPIF-7e.