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

Question

$C_2^{2 - }$, $O_2^{-}$, CO, NO

$NO^{+}$, $C_2^{2 - }$, CN^-, $N_2$

CN^-, $N_2$, $O_2^{2-}$, $C_2^{2 - }$

$N_2$, $O_2^{-}$, $NO^{+}$, CO

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