What is the primary function of physical or electronic Flight Progress Strips (fichas de progreso de vuelo) on an air traffic control operating position?

1. To provide a continuous, real-time chronological record of aircraft flight plan data, assigned levels, route clearances, control revisions, and coordination handoffs, maintaining the controller's situational awareness.
2. To serve as paper receipts for landing fees.
3. To record passenger meal orders.
4. To log daily control tower visitor names.