Question: Upon updating an existing AM Influence Subscription, what action does the NEF take if it receives a successful response from the UDR?
Option 1: The NEF updates the "Individual AM Influence Subscription" resource and responds to the AF with either an HTTP "200 OK" or "204 No Content" message.
Option 2: The NEF interacts with the AF to request additional policy data before updating the subscription.
Option 3: The NEF sends a confirmation request back to the UDR to verify the update.
Option 4: The NEF immediately terminates the existing AM Influence Subscription.
Explanation: This is correct because, according to the specified procedure for updating an AM influence subscription, after receiving a successful response from the Unified Data Repository (UDR), the Network Exposure Function (NEF) is required to update the respective resource ("Individual AM Influence Subscription") and then notify the Application Function (AF) of the success with either a "200 OK" (indicating the updated resource is returned in the response) or a "204 No Content" (indicating the action was successful but no content is returned) HTTP response message. This ensures both the NEF's and AF's states remain synchronized regarding the subscription update.