Among the following groupings,which represents the collection of isoelectronic species?
- A$NO^{+}, C_2^{2-}, O_2^{-}, CO$
- B$N_2, C_2^{2-}, CO, NO$
- C$CO, NO^{+}, CN^{-}, C_2^{2-}$
- D$NO, CN^{-}, N_2, O_2^{-}$
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