Question: Upon successful creation of a new MBS User Service, what does the NEF include in the `Nnef_MBSUserService_Create` response to the AF, along with an HTTP "201 Created" status code?
Option 1: A "Content-Type" header field specifying the format of the MBSUserService data structure.
Option 2: A "Location" header field containing the URI of the created resource, and a response body with a representation of the created "Individual MBS User Service".
Option 3: An "Authorization" header field to confirm the AF's permissions for future operations.
Option 4: A "Retry-After" header field suggesting when to retry if the creation had temporarily failed.
Explanation: Upon successful creation of a new MBS User Service, the NEF needs to inform the Application Function (AF) about the outcome and provide details for future reference. Including a "Location" header with the URI of the created resource allows the AF to easily identify and manage the newly created service. Additionally, providing a representation of the created "Individual MBS User Service" within the response body gives the AF all necessary details about the service's configuration, as per the specified MBSUserService data structure. This approach aligns with RESTful API practices for resource creation responses.