Question: What is the correct format for constructing a Short Message Service Function (SMSF) Fully Qualified Domain Name (FQDN) in a 5G network, as per 3GPP specifications?
Option 1: <label(s) assigned by a PLMN>.smsf.5gc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 2: smsf.<label(s) assigned by a PLMN>.mnc<MNC>.mcc<MCC>.5gc.3gppnetwork.org
Option 3: 5gc.mnc<MNC>.mcc<MCC>.<label(s) assigned by a PLMN>.smsf.3gppnetwork.org
Option 4: <label(s) assigned by a PLMN>.mnc<MNC>.mcc<MCC>.smsf.5gc.3gppnetwork.org
Explanation: The correct format for an SMSF FQDN, as per the specified guidelines, involves prefixing the Home Network Domain Name with 'smsf' and incorporating labels assigned by a Public Land Mobile Network (PLMN), thus requiring the format to start with these PLMN-assigned labels, followed by '.smsf', and then the rest of the domain name components in the specified order. This ensures unique identification for Diameter signaling purposes in 5G networks.