The number of unpaired electrons in [NiC...

The number of unpaired electrons in `[NiCl_(4)]^(2-), Ni(CO)_(4) and [Cu(NH_(3))_(4)]^(2)`, respectively are

A

`2,2,1`

B

`2,0,1`

C

`0,2,1`

D

2,2,0

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