Which one of the following groupings represents a collection of isoelectronic species?
- A$Na^{+}, Ca^{2+}, Mg^{2+}$
- B$N^{3-}, F^{-}, Na^{+}$
- C$Be, Al^{3+}, Cl^{-}$
- D$Ca^{2+}, Cs^{+}, Br^{-}$
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