Question: Which protocols are utilized by the CSC-16 reference point for transporting and routing subscription/notification related signaling between group management servers in different Mission Critical (MC) systems?
Option 1: HTTP-1, HTTP-2, and HTTP-3
Option 2: SIP-2 and SIP-3
Option 3: Diameter and SS7
Option 4: TCP/IP and UDP
Explanation: The CSC-16 reference point specifically employs SIP-2 and SIP-3 for handling subscription/notification related signaling, crucial for efficient management of mission-critical service groups across different security domains, leveraging the Session Initiation Protocol (SIP) for signaling purposes.