The correct answer to the question is : X: Armature, Y : Brush, Z : Commutator
EXPLANATION :
Before going to answer this question, first we have to understand Commutator, Brush and Armature.
These three electric components are part of electric motor.
Armature is the rotating part of the electric motor or generator which contains coils of wire wounded over a metallic core.
The commutator plays a crucial role in case of electric motor. The function of the commutator is to reverse the direction of current.
The brush is the important part of an electric motor which is connected to the battery. It is attached to the rotating ring which gives the current to the coil.
From above, it is obvious that X stands for armature.
As Y is connected to the battery and supplies the current to the coil, so it is the brush.
Z is the commutator which changes the direction of current.