Which of the following statements are correct?

(i) Aluminium forms [AlF₆]^3- ion while boron forms only [BF₄]^- ion due to presence of d-orbitals in aluminium.

(ii) The first member of a group differs from the heavier members in its ability to form pπ-pπ multiple bonds to itself and to other second row elements. While heavier member forms dπ-pπ bonds.

(iii) d-orbitals contribute more to the overall stability of molecules than pπ-pπ bonding of second row elements.

(a) (i) (ii) (iii)

(b) (i) (iii)

(c) (i) (ii)

(d) (ii) (iii)