Question: In a 5G System (5GS), which of the following operations are supported by the Charging Function (CEF) for network slice performance and analytics subscription using Management Network Slice (MnS)?
Option 1: Only Subscribe operation
Option 2: Only Unsubscribe operation
Option 3: NotifyFileReady operation only, with no subscription management
Option 4: Subscribe operation, Unsubscribe operation, and NotifyFileReady
Explanation: In the context of network slice performance and analytics charging in a 5G System, the Charging Function (CEF) is designed to support comprehensive management through Management Network Slice (MnS). This includes not just initiating subscriptions (Subscribe operation) but also managing existing ones (Unsubscribe operation) and notifying when relevant data is ready (NotifyFileReady), ensuring dynamic and responsive network slice performance analytics. These operations collectively facilitate efficient charging management and network optimization, highlighting the importance of all three in a functional MnS setup.