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

1. A. cis – [Pt(NH3)2Cl2]
2. B. cis – [Co(en)2Cl2]
3. C. trans – [Co(en)2Cl2]
4. D. trans – [Pt(NH3)2Cl2]

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