Question: What is the correct format for the realm part of the NAI for CP-PRUK ID as specified in IETF RFC 7542?
Option 1: prose-cp.mnc<MNC>.mcc<MCC>.5gc.3gppnetwork.org
Option 2: prose-cp.5gc.mnc<MNC>.mcc<MCC>.org
Option 3: prose-cp.5gc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 4: prose-cp.mnc<MNC>.mcc<MCC>.5gc.org
Explanation: The realm part of the NAI for CP-PRUK ID should be in the form "prose-cp.5gc.mnc<MNC>.mcc<MCC>.3gppnetwork.org" as specified in IETF RFC 7542, where <MNC> and <MCC> represent the Mobile Network Code and Mobile Country Code respectively. This format is used to identify the 5G network and ensure proper routing of messages.