Physical and Chemical Changes

A man painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from sun.
(iii) make it look beautiful.
(iv) make it dust free.
Which of the above statement(s) is/are correct?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) only (ii)
(d) (i) and (iii)