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Among the following groupings which repr...

Among the following groupings which represents the collection of isoelectronic species?

A

`NO^(+),C_(2)"^(2-),O,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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