Question: In a 5G System (5GS), which interface is used for exchanging Charging Data Request/Response messages between the Charging Event Function (CEF) and the Charging Handler Function (CHF) for network slice performance and analytics charging?
Option 1: N4 Interface
Option 2: SBI (Service Based Interface)
Option 3: Mt (Management Plane) Interface
Option 4: F1 Interface (defined for Control and User Plane Separation)
Explanation: The correct answer is Option 2 because the charging interaction for performance and analytics charging functionality in a 5GS involves Charging Data Request/Response messages, which utilize the Service Based Interface (SBI) for exchanges between the CEF and CHF, facilitating charging management services.