Question: What is the correct format for constructing an EPC node's DNS subdomain, based on Mobile Country Code (MCC) and Mobile Network Code (MNC)?
Option 1: epc.mnc<MNC>.mcc<MCC>.org
Option 2: node.epc.mnc<MNC>_mcc<MCC>.net
Option 3: node.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 4: dns.epc.mnc<MNC>-mcc<MCC>.3gpp.org
Explanation: The correct answer reflects the specified format for constructing an EPC node's DNS subdomain. This format includes the 'node' label, followed by 'epc', then the MNC and MCC values, and finally the '.3gppnetwork.org' domain, ensuring a standardized and unique identifier for each operator's network.