Question: What is the primary purpose of the `tsCancelChangeover` ACTION in Telecommunications Management, specifically within the Charging Management domain for the Circuit Switched (CS) domain?
Option 1: To initiate a swap between two active tariff systems.
Option 2: To schedule a new tariff system change-over at a later time.
Option 3: To cancel a previously scheduled tariff system change-over.
Option 4: To confirm the current tariff system in use.
Explanation: The `tsCancelChangeover` ACTION is defined to cancel a previously scheduled change-over of the tariff system. This action is crucial for managing and adjusting planned changes to tariff systems, ensuring flexibility in charging management. It does not relate to initiating swaps, scheduling new changes, or confirming current systems.