Which part of brain maintains posture and balance of human body?

Cerebellum

 The correct answer is Option (3)- Cerebellum

The part of the brain that maintains posture and balance of the human body is the Cerebellum.

The cerebellum is a vital component in the human brain as it plays a role in motor movement regulation and balance control. The cerebellum coordinates gait and maintains posture, controls muscle tone and voluntary muscle activity but is unable to initiate muscle contraction.

Therefore, the correct answer is Cerebellum.