Question: Upon receiving an HTTP POST request for creating a new Individual ECS Address Configuration Information resource, what action may the V-NEF take if an External Group Identifier is provided in the request?
Option 1: Immediately create the ECS Address Configuration Information resource without further validation.
Option 2: Reject the request due to the presence of an External Group Identifier.
Option 3: Interact with the V-UDR to update existing ECS Address Roaming Information.
Option 4: Determine the HPLMN of the UE(s) (e.g., based on the Realm in the identifier) and invoke the Nnef_UEId_Get service to retrieve the Internal Group Identifier.
Explanation: When an External Group Identifier is included in the request for creating a new Individual ECS Address Configuration Information resource, the V-NEF may need to identify the Home PLMN (HPLMN) of the User Equipment(s) (UE(s)) to properly process the request. This involves determining the HPLMN based on the provided identifier (e.g., using the Realm) and then invoking the Nnef_UEId_Get service to obtain the corresponding Internal Group Identifier from the NEF of the HPLMN, ensuring accurate handling of the request within the network's exposure function framework.