Question: What is the correct format for deriving a home network realm from an IMSI with a 3-digit MNC, according to telecom standards?
Option 1: mnc<MNC>-mcc<MCC>.org
Option 2: gan.mnc0<MNC>.mcc<MCC>.3gppnetwork.org (assuming a leading zero for the MNC)
Option 3: gan.mnc<MNC>.mcc<MCC>.3gppnetwork.org (where <MNC> is directly used without modification)
Option 4: <MCC>-<MNC>.telecom.net
Explanation: According to telecom standards, the correct format for deriving a home network realm from an IMSI involves using the MCC and MNC directly (without adding leading zeros for 3-digit MNCs) in the form gan.mnc<MNC>.mcc<MCC>.3gppnetwork.org. This ensures compatibility with Internet domain name specifications. Option 3 correctly reflects this format for a 3-digit MNC scenario.