In which of the following pairs both the complexes show optical isomerism

cis - [Cr(C₂O₄)₂CI₂]^3-, cis -[Co(NH₃)₄CI₂]

[Co(en)₃]CI₃, cis - [Co(en)₂CI₂]CI

[PtCI(dien))CI, [NiCI₂Br₂]^2-

More than one of the above

None of the above