Among [Ni(CO)(4)], [NiCl(4)]^(2-), [Co (...

Among `[Ni(CO)_(4)], [NiCl_(4)]^(2-), [Co (NH_(3))_(4) Cl_(2)] Cl, Na_(3) [CoF_(6)], Na_(2)O_(2)` and `CsO_(2)`, the total number of paramagnetic compounds is

A

2

B

3

C

4

D

5

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