Which one of the following constitutes a group of the isoelectronic species?

  • A
    $C_2^{2-}, O_2^-, CO, NO$
  • B
    $NO^{+}, C_2^{2-}, CN^{-}, N_2$
  • C
    $CN^{-}, N_2, O_2^{2-}, C_2^{2-}$
  • D
    $N_2, O_2^-, NO^{+}, CO$

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