A stepper motor is

[A].	a two phase induction motor
[B].	is a kind of rotating amplifier
[C].	is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
[D].	is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis

Answer: Option D

Explanation:

When input pulses are applied, the motor moves in steps.