Question: What is the correct format for constructing an EPC node's DNS subdomain, based on Mobile Network Code (MNC) and Mobile Country Code (MCC), to ensure operator control and avoid conflicts with future 3GPP standards?
Option 1: epc.mnc<MNC>.mcc<MCC>.operator.net
Option 2: node.epc.mnc<MNC>-mcc<MCC>.3gpp.org
Option 3: mnc<MNC>.mcc<MCC>.epc.3gppnetwork.net
Option 4: node.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Explanation: The correct format involves prefixing 'node' to the beginning of the Home Network Realm/Domain, followed by 'epc', then the MNC and MCC labels with their respective values, and finally ending with '.3gppnetwork.org'. This ensures the DNS subdomain is under the operator's control, preventing potential conflicts with future 3GPP standards updates.