Question: What is the correct format for constructing a Routing Area Identity (RAI) Fully Qualified Domain Name (FQDN) for use by core network nodes in an EPC?
Option 1: rac<RAC>.lac<LAC>.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 2: lac<LAC>.rac<RAC>.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Option 3: mnc<MNC>.mcc<MCC>.lac<LAC>.rac<RAC>.3gppnetwork.org
Option 4: rac<RAC>.lac<LAC>.rac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Explanation: The correct format for constructing a Routing Area Identity (RAI) Fully Qualified Domain Name (FQDN) is by adding the label "rac" to the beginning of the Home Network Realm/Domain, followed by the RAC, LAC, and then the MNC and MCC. This ensures that the FQDN is unique and can be used by core network nodes in an EPC.