Which of the following statements are true about the brain?

(i) The main thinking part of brain is hindbrain.

(ii) Centres of hearing, smell, memory, sight, etc., are located in forebrain.

(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hindbrain.

(iv) The cerebellum does not control the posture and balance of the body.