Question: What is the primary purpose of the CAPIF-4e reference point in the context of 3GPP Northbound APIs?
Option 1: To facilitate secure data transfer between User Equipment (UE) and the Public Land Mobile Network (PLMN)
Option 2: For publishing service API information between the API publishing function and the CAPIF core function
Option 3: To manage session establishment for voice calls across different trust domains
Option 4: To handle billing and charging for data services within a PLMN
Explanation: The CAPIF-4e reference point is specifically utilized for the publication of service API information, making APIs discoverable and accessible across different trust domains, which does not directly involve UE data transfer, voice call session management, or billing/charging processes.