Question: In a 5G System utilizing OAuth2 for authorization, what is the primary role of the NRF (Network Repository Function) when an NF Service Consumer accesses the Namf_EventExposure API?
Option 1: Resource Server providing the Namf_EventExposure service
Option 2: Client of the Namf_EventExposure API requesting event exposures
Option 3: Authorization Server issuing tokens for API access
Option 4: Service Discovery endpoint for locating Namf_EventExposure instances
Explanation: In the context of OAuth2 authorization for accessing the Namf_EventExposure API, the NRF acts as the Authorization Server. This means it is responsible for authenticating NF Service Consumers and issuing access tokens that grant permission to consume services offered by the Namf_EventExposure API, securing access to the API's event exposure services in a 5G System.