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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