Question: In a 5G network, what triggers the inclusion of an NG-RAN Node's Global RAN Node ID in the Broadcast Empty Area List NG-RAN?
Option 1: When an NG-RAN Node successfully broadcasts a Cell Broadcast Service (CBS) message to all intended UEs.
Option 2: When an NG-RAN Node responds to the AMF with a WRITE-REPLACE WARNING RESPONSE or PWS CANCEL RESPONSE without including the respective Completed/Canceled Area List IE.
Option 3: Upon initial registration of an NG-RAN Node with the Access and Mobility Management Function (AMF).
Option 4: When all UEs in an NG-RAN Node's area have acknowledged receipt of a CBS message.
Explanation: The correct answer highlights a scenario where an NG-RAN Node's ID is added to the Broadcast Empty Area List NG-RAN. This occurs when the node responds to the AMF with certain response messages (WRITE-REPLACE WARNING RESPONSE or PWS CANCEL RESPONSE) lacking expected area list IEs, indicating an 'empty' status regarding broadcast areas, crucial for managing and troubleshooting Cell Broadcast Services in 5G networks.