In an ionic solid \( \mathrm{AB}_{2} \mathrm{O}_{4} \), the oxide ions form CCP. ' \( \mathrm{A}...

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In an ionic solid \( \mathrm{AB}_{2} \mathrm{O}_{4} \), the oxide ions form CCP. ' \( \mathrm{A} \) ' and ' \( \mathrm{B} \) ' are metal ions in which one is bivalent and another is trivalent (not necessarily in given order). If all the bivalent ions occupy octahedral holes and the trivalent ions occupy tetrahedral and octahedral voids in equal numbers, then the fraction of octahedral voids unoccupied is
(a) \( \frac{1}{2} \)
(b) \( \frac{3}{4} \)
(c) \( \frac{1}{4} \)
(d) \( \frac{7}{8} \)
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