Question: What is the primary purpose of the Nnrf_AccessToken_Get service operation in the 5G System security architecture?
Option 1: To authenticate the NF Service Consumer.
Option 2: To provide an Access Token to the NF Service Consumer, enabling access to requested NF services.
Option 3: To authorize the NF Service Producer to provide services to the NF Service Consumer.
Option 4: To register the NF Service Consumer with the NRF.
Explanation: The Nnrf_AccessToken_Get service operation is used by the NF Service Consumer to request an Access Token from the NRF, which grants access to specific NF services. This token contains claims that include the NF Instance Id of the NRF (issuer), NF Instance Id of the NF Service Consumer (subject), and expected service name (scope). The primary purpose of this operation is to provide the Access Token, enabling the NF Service Consumer to access the requested NF services.