Question: What is the format of the realm part of the Network Access Identifier (NAI) when the SUPI is defined as an IMSI in SNPN scenarios where the NID is available?
Option 1: 5gc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 2: 5gc.nid<NID>.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 3: 5gc.hnkey<Home Network Public Key Identifier>.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 4: 5gc.rid<Routing Indicator>.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Explanation: According to the text, when the SUPI is defined as an IMSI in SNPN scenarios where the NID is available, the realm part of the NAI shall be constructed by converting the leading digits of the IMSI (MNC and MCC) into a domain name, and including the NID of the SNPN. The resulting realm part of the NAI shall be in the form: 5gc.nid<NID>.mnc<MNC>.mcc<MCC>.3gppnetwork.org