Question: What is the primary purpose of the CAPIF_Publish_Service_API in a 3GPP Northbound API framework?
Option 1: To establish secure authentication protocols between User Equipment (UE) and the network.
Option 2: To manage Quality of Service (QoS) parameters for prioritizing data traffic.
Option 3: To facilitate direct communication between different Network Functions (NFs).
Option 4: To publish and manage service API information through interaction with the CAPIF core function over CAPIF-4.
Explanation: The correct answer, Option 4, accurately reflects the primary purpose of the CAPIF_Publish_Service_API as described. This API is specifically designed to enable the publishing and management of service API information through its interaction with the CAPIF core function, utilizing the CAPIF-4 interface for this purpose. The other options are incorrect because they describe functions unrelated to the API's defined role in managing and publishing service API information within the 3GPP Northbound API framework.