Answer:
The correct option is: D. A small lever in a relay switch
Explanation:
Armature is a constituting part of an electric machine, that can be used as a stationary or rotating part. It is a conductor or a conducting coil that carries alternating current and can generate electromotive force.
In a solenoid, the movable steel or iron part that functions as a switch or relay is also termed as the armature.
