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

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`

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

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