Question: In a 5G network, when creating an 'AM Influence Subscription' resource via the Network Exposure Function (NEF) Northbound API, what action does the NEF take if it receives an error response from the Unified Data Repository (UDR) with a 'ProblemDetails' data structure indicating an application error?
Option 1: The NEF ignores the error and creates the subscription resource.
Option 2: The NEF relays the error response to the Application Function (AF) but only if the AF has specified error handling preferences.
Option 3: The NEF attempts to store the policy data in an alternative repository before responding to the AF.
Option 4: The NEF does not create the resource and responds to the AF with a corresponding application error.
Explanation: This is correct because, if the NEF receives an error response from the UDR with a 'ProblemDetails' data structure indicating an application error, it shall relay this error response to the AF with a corresponding application error (when applicable) and not proceed with creating the resource, ensuring errors are properly communicated back to the requesting entity (AF), preventing potential inconsistencies or unseen failures in the network's operation.