Question: What is the primary purpose of the Nnef_EventExposure_Unsubscribe service operation in the 5G System (5GS)?
Option 1: To create a new event exposure subscription in the Network Exposure Function (NEF).
Option 2: To modify an existing event exposure subscription in the NEF.
Option 3: To retrieve information about an event exposure subscription from the NEF.
Option 4: To delete an already defined event exposure subscription in the NEF.
Explanation: The Nnef_EventExposure_Unsubscribe service operation is used by the NF consumer to delete an event exposure subscription that has already been defined in the Network Exposure Function (NEF). This operation requires a Subscription Correlation ID as input and returns an operation execution result indication as output.