According to the paragraph, we can say that the air traffic controllers ____________________________. Used to organize and expedite the flow of ai...

According to the paragraph, we can say that the air traffic controllers ____________________________.

Used to organize and expedite the flow of air traffic.
Are never in charge of directing aircraft on the ground.
Have as one of the most important aims to avoid accidents.
Aren’t responsible for any information beyond the ground traffic.
a) Used to organize and expedite the flow of air traffic.
b) Are never in charge of directing aircraft on the ground.
c) Have as one of the most important aims to avoid accidents.
d) Aren’t responsible for any information beyond the ground traffic.