Find the correct set with isoelectronic species.
- A$N^{3-}, F^{-}, O_2, Ca^{2+}$
- B$Ca^{2+}, Cl^{-}, Al^{3+}, O_2^-$
- C$N^{3-}, Mg^{2+}, F^{-}, O^{2-}$
- D$Mg^{2+}, O_2^-, Cl^{-}, N_3^-$
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