Professional tennis has what two things to help with line calls? ob
Ос
Od
Computers, Sensor Machines
Drones, Blimps
Helicopters, lifts
I phones, Chromebooks

The correct option is;

Computer, Sensor Machines

Explanation:

In order to detect the exact location of the landing of a tennis ball, a device known as Hawk-Eye is used

Hawk-Eye tracks the balls trajectory using visual sensors and computing technology combined as computerize vision that monitors the path of the  ball path and by statistical computation, graphically presents the most probable path in which the ball travels which can then be viewed onscreen as what is known as a Shot Spot.

The Hawk-Eye system is applied in ball playing games such as tennis, volley ball, association football, hurling, rugby union, Garlic football, badminton, and cricket.

the answer should be in the picture.