What is one of the primary responsibilities of a ground controller?

The primary responsibility of a ground controller is to manage aircraft operations on the ground. This includes directing aircraft and vehicle movements on taxiways and runways, ensuring safe and efficient ground traffic. Ground controllers communicate with pilots to provide instructions for taxiing to and from the runway, gates, and other areas of the airport. They play a crucial role in maintaining safety and order on the ground by preventing collisions and ensuring that aircraft and vehicles move smoothly throughout the airport environment.

In the context of airport operations, assisting in in-air navigation, providing weather updates, and coordinating flight takeoffs fall under the duties of other types of air traffic controllers, such as tower and approach controllers, rather than the ground controller's scope. Thus, the correct answer reflects the specific skill set and responsibilities that ground controllers are trained to manage within the air traffic control structure.