Question: What does the 'Additional Network Node Diameter Address' parameter primarily identify in the context of SMS routing?
Option 1: A third-party SMS gateway's IP address
Option 2: An additional Diameter Name and Realm for an MT-SMS target node or SMS Router associated with a specific ISDN number
Option 3: The primary DNS server for SMS message delivery
Option 4: The MME's (Mobility Management Entity) S1 interface endpoint
Explanation: This parameter primarily identifies an additional Diameter Name and Realm for either an MT-SMS target node or an SMS Router linked to a specific ISDN number, facilitating communication between network nodes in SMS delivery scenarios.