Which of the following statements are true w.r.t. the kwashiorkor disease?
(i) It is usually observed in children in the age group 1-5 years.
(ii) It is caused by severe protein deficiency even if sufficient carbohydrates and fats are consumed.
(iii) It is usually seen in infants below the age of 1 year.
(iv) It is caused by deficiency of proteins, fats and carbohydrates in diet.