Which of the following statement(s) is/are incorrect for CO₂?

(i) In laboratory CO₂ is prepared by the action of dilute HCl on calcium carbonate

(ii) Carbon dioxide is a poisonous gas

(iii) Increase in carbon dioxide content in atmosphere lead to increase in green house effect.

(iv) CO₂ as dry ice is used as a refrigerant for ice cream and frozen food.

(a) (i) and (ii)

(b) Only (ii)

(c) (i), (ii) and (iii)

(d) (ii) and (iii)