Which formulation most accurately describes a working principle of pneumatic linear

actuators?

Select one alternative:

pneumatic linear actuator uses electrical power/energy to realize linear motion of the

actuator piston rod

pneumatic linear actuator uses compressed air as source of driving power/energy to

realize linear motion of the actuator piston rod

pneumatic linear actuator uses piezoelectric effect to realize linear motion of the actuator

piston rod

pneumatic linear actuator uses hydraulic power/energy to realize linear motion of the

actuator piston rod