Question: In a 5G network, when an Application Function (AF) requests MBS Group Message Delivery via the Network Exposure Function (NEF), what is the primary action taken by the NEF before provisioning towards the Multicast/Broadcast Service Function (MBSF)?
Option 1: The NEF immediately provisions the MBS User Service and MBS User Data Ingest Session without any preliminary checks.
Option 2: The NEF translates the provided MBS service area into a list of Tracking Area Identifiers (TAIs) and/or cell IDs before sending to the AF for confirmation.
Option 3: The NEF checks whether the AF is authorized to perform the MBS Group Message Delivery operation as defined in relevant architectural enhancements for 5G multicast-broadcast services.
Option 4: The NEF sends a notification to all UEs within the specified geographical area or civic address to prepare for the incoming broadcast.
Explanation: Before proceeding with the provisioning of MBS User Service and MBS User Data Ingest Session towards the MBSF, the NEF must first verify that the requesting AF has the necessary authorization. This step is crucial for ensuring security and compliance with defined standards for architectural enhancements in 5G multicast-broadcast services.