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