Question: Upon receiving a UP path management event notification from the SMF via NEF, how should the Application Function (AF) respond to confirm receipt of the event notification?
Option 1: Respond with an HTTP POST request containing AfAckInfo data
Option 2: Respond with a "204 No Content" status code
Option 3: Initiate an application layer relocation without responding
Option 4: Send a GET request to the NEF for further instructions
Explanation: According to the specified telecom protocol, upon receipt of the event notification from the NEF, the AF is required to respond with a "204 No Content" status code to confirm that the event notification has been received. This response acknowledges the notification without requiring additional data in the response body, which is the purpose of the "204 No Content" HTTP status code. The AF may subsequently take further actions, but the immediate response to confirm receipt is the "204 No Content" status code.