Question: What is the purpose of the network slice-specific authentication and authorization procedure in a 5G System (5GS)?
Option 1: To enable the UE to authenticate with multiple networks simultaneously.
Option 2: To provide a secure connection between the UE and the AAA-S for accounting purposes only.
Option 3: To enable the AAA-S via the NSSAAF to (re-)authenticate or (re-)authorize the upper layers of the UE.
Option 4: To allow the network to prioritize traffic based on the UE's subscription status.
Explanation: The correct answer is Option 3 because the network slice-specific authentication and authorization procedure is designed to enable the AAA-S via the NSSAAF to (re-)authenticate or (re-)authorize the upper layers of the UE, as stated in the provided text. This procedure allows for secure authentication and authorization of the UE's access to specific network slices, ensuring that only authorized UEs can access the corresponding network resources.