Question: What is the primary purpose of the Nchf_SpendingLimitControl_Unsubscribe service operation in the 5G System (5GS)?
Option 1: To subscribe to status changes for all policy counters available at the CHF.
Option 2: To update the spending limit control policy at the CHF.
Option 3: To cancel the subscription to status changes for all policy counters available at the CHF.
Option 4: To retrieve the current spending limit control policy from the CHF.
Explanation: The Nchf_SpendingLimitControl_Unsubscribe service operation is used to cancel an existing subscription to status changes for all policy counters available at the Charging Function (CHF). This allows a network function to stop receiving updates on spending limit controls, which is essential for managing policy rules and ensuring efficient resource allocation in the 5G network.