Question: What is the primary purpose of the CSC-20 reference point between the Configuration Management Server and the MC Gateway Server in Mission Critical (MC) systems?
Option 1: To establish direct media transfer for mission critical communications
Option 2: For subscription and notification signalling related to shared user configuration information to facilitate migration between MC systems
Option 3: To manage Quality of Service (QoS) parameters for MC services across different network slices
Option 4: For authentication and authorization of users accessing MC services
Explanation: The CSC-20 reference point is specifically utilized for handling subscription and notification signalling, crucial for sharing user configuration information among different MC systems, enabling seamless migration between these systems for continuity and consistency of service.