Mark the correct statement about air traffic control according to lines 22

✂️ a) Each plane is directed by just one controller.

✂️ b) Ground controllers observe planes on radar only.

✂️ c) The radar room is located above the control tower.

✂️ d) Airplane landings have priority over departures.

✂️ e) When visibility is good, ground controllers are not needed.

Mark the correct statement about air traffic control according to lines 22 - 38.