Which of the followinf statements are correct ?
(I) in the long form of periodic table, the number of period indicates the value of principal quantum number.
(II)there are four d-block series comprising of total 40 elements in the long form of periodic table.
(III)s-block,d-block and f-block elements are metals
(A) (I) and(II)only
(C) (II) and(III) only
(D)(I),(II) and (III)