Question: Upon receiving a successful response from the AAnF for an AKMA application key request, how does the NEF respond to the Authorized Function (AF) if the 'anonInd' attribute is set to 'false' in the incoming request?
Option 1: With a 200 OK status code, including a KAF, expiration time of the KAF, and the GPSI (external ID) translated from the SUPI.
Option 2: With a 403 Forbidden status code and a ProblemDetails data structure indicating 'K_AKMA_NOT_PRESENT'.
Option 3: Only with a KAF and its expiration time, without any identifier.
Option 4: By requesting additional authentication from the AF before responding.
Explanation: According to the specified interaction, if the 'anonInd' attribute is not set to 'true' (implying it's set to 'false'), the NEF's response to the AF, after a successful retrieval from the AAnF, includes a 200 OK status code along with a Key Authentication Factor (KAF), its expiration time, and optionally the Global Platform Secure Identifier (GPSI) if translated from the Subscriber Permanent Identifier (SUPI) received from the AAnF. The SUPI itself is not shared with the external AF for security reasons.