Question: In a 5G System (5GS), when using the NonUeN2MessageTransfer service operation for Public Warning System (PWS) services, what determines to which NG-RAN nodes the N2 Message Container needs to be forwarded to?
Option 1: Message Identifier IE and Serial Number IE
Option 2: List of TAIs (Tracking Area Identifiers) IE
Option 3: Warning Area IE and RAT Selector NG-RAN
Option 4: Message Type IE and Send Write-Replace-Warning-Indication IE
Explanation: According to specifications for NonUeN2MessageTransfer in the context of PWS services, the List of TAIs (Tracking Area Identifiers) IE is used by the Access and Mobility Management Function (AMF) to determine the NG-RAN nodes that should receive the N2 Message Container. If this IE is absent, the message is forwarded to all NG-RAN nodes served by the AMF, subject to the RAT Selector NG-RAN.