Question: What is the purpose of the Nnef_DNAIMapping_Subscribe service operation in the 5G System?
Option 1: To unsubscribe from DNAI information for a specific AF and NWDAF.
Option 2: To request one-time reporting of Event Reporting Information.
Option 3: To subscribe to DNAI information by providing specific information of AF and NWDAF.
Option 4: To update the Expiry time for an existing subscription.
Explanation: The Nnef_DNAIMapping_Subscribe service operation is used by a consumer to subscribe to DNAI information by providing specific information about the Application Function (AF) and Network Data Analytics Function (NWDAF). This allows the consumer to receive DNAI information, which may be used for various purposes such as analytics or optimization.