Question: What is the primary purpose of the Nnssf_NSSAIAvailability_Unsubscribe service operation in the 5G System (5GS)?
Option 1: To subscribe to notifications for Network Slice Replacement or for Network Slice Instance Replacement.
Option 2: To unsubscribe to a notification of any previously subscribed changes to the NSSAI availability information.
Option 3: To update the Subscription Correlation ID.
Option 4: To retrieve the current NSSAI availability information.
Explanation: The Nnssf_NSSAIAvailability_Unsubscribe service operation is used by a NF Service Consumer (e.g. AMF) to unsubscribe to notifications for changes to the NSSAI availability information, as well as for Network Slice Replacement or for Network Slice Instance Replacement. This allows the consumer to stop receiving updates on previously subscribed events.