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Which one among the following exhibits optical isomerism

A.

`cis[Co(NH_3)4Cl_2]Cl`

B.

trans`[Co(NH_3)_4Cl_2]Cl`

C.

cis`[Co(en)_2Cl_2]Cl`

D.

trans `[Co(en)_2Cl_2]Cl`