Question: When a 5G-RG or W-AGF acting on behalf of an FN-RG (or N5GC device) receives a SECURITY MODE COMMAND message requesting an IMEISV, what information element should it include if the IMEISV is not available but a MAC address is available?
Option 1: PEI for EUI-64
Option 2: PEI for IMEI
Option 3: PEI for IMSI
Option 4: non-IMEISV PEI
Explanation: According to the specification, when a 5G-RG or W-AGF acting on behalf of an FN-RG (or N5GC device) receives a SECURITY MODE COMMAND message requesting an IMEISV and the IMEISV is not available but a MAC address is available, it should include the non-IMEISV PEI information element.