In a closed packed structure of mixed oxides, the lattice is composed of mixed oxides ions. One eighth of tetrahedral voids are occupied by divalent cations ( A2+ ) while one half of octahedral voids are occupied by trivalent cation ( B3+ ). The formula of mixed oxide is :
a. A2BO3
b. AB2O3
c. A2BO4
d. AB2O4