It's A. Actuator : "Actuators: Devices that collect data from sensors and perform the required action. Actuators consume energy to produce physical action like creating a motion or controlling a system. Examples of actuators include electric motor that uses electric power to generate motion, hydraulic actuators use fluid pressure to generate motion. In IoT, actuators help to automate the operations by applying a force based on the dynamics of data generated by sensors."

it shoud be A. Actuators help to automate the operations by applying a force based on the dynamics of data generated by sensors. Sensors should be able to detect a wide range of physical phenomenon ranging from temperature, pressure, to motion and magnetic fields.

Should be A.

Should be an Actuator

Although correct answer should be "A", on the practice test (DELL Academy) they answered it as sensor.

The answer is A. actuator and not C

Its A Actuator

should be a