Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

Question

cis-[Pt(NH₃)₂Cl₂]

trans-[Pt(NH₃)₂Cl₂]

cis-[Co(en)₂Cl₂]⁺

trans-[Co(en)₂Cl₂]⁺

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