According to ICAO Annex 11 and SLCAR Part 1A, what is the primary objective of the Air Traffic Control (ATC) service?

1. To prevent collisions between aircraft and between aircraft and obstacles on the maneuvering area, and to expedite and maintain an orderly flow of air traffic
2. To monitor airline flight schedules and enforce ground handling punctuality
3. To provide weather forecasting and meteorological observations for all departing aircraft
4. To issue landing fees and administrative clearances for commercial operators