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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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