Identify the isoelectronic species from the following groups.
- A$K^{+}, Cl^{-}, Ca^{2+}, Sc^{3+}$
- B$Ba^{2+}, Sr^{2+}, K^{+}, S^{2-}$
- C$N^{3-}, O^{2-}, F^{-}, S^{2-}$
- D$Li^{+}, Mg^{2+}, Ca^{2+}, Na^{+}$
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