Question: What is the primary purpose of the Nnssaaf_NSSAA_Authenticate service operation in a 5G system?
Option 1: To authenticate network slice-specific messages between the NF consumer and the corresponding AAA-S server.
Option 2: To authorize network functions based on user credentials.
Option 3: To manage network slice configuration for different S-NSSAIs.
Option 4: To handle EAP ID responses from the UE.
Explanation: The Nnssaaf_NSSAA_Authenticate service operation is used to relay Network Slice specific authentication messages between the NF consumer and the corresponding AAA-S server, which handles network slice-specific authentication for the requested S-NSSAI. This ensures secure authentication of network slices in a 5G system.