Question: During a Network Slice-Specific Authentication and Authorization procedure for a 5G System, how does a Mobile Equipment (ME) determine the appropriate Slice Subscriber Identity Module (SSIM) to use based on the criteria related to S-NSSAI?
Option 1: By selecting the SSIM with the highest priority AID listed in EFDIR, regardless of the '3GPP SSIM' App Code.
Option 2: Based on matching the S-NSSAI from the NSSAA procedure against a list and ensuring the AID is identified with ‘3GPP SSIM’ App Code in EFDIR.
Option 3: Automatically, as the ME always uses a default SSIM for all Network Slice-Specific Authentication and Authorization procedures.
Option 4: Through a manual selection process by the user, choosing from a list of available SSIMs on the device.
Explanation: The correct answer is Option 2 because it accurately reflects the criteria for selecting an appropriate SSIM. This involves two key steps: Matching S-NSSAI to ensure network slice specificity, and verifying the ‘3GPP SSIM’ App Code in EFDIR to ensure adherence to 3GPP security standards.