Which complex can show geometrical isomerism?

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[Co(NH₃)6]3+ [Co(NH₃)3(H₂O)3]3+ Correct [Ni(CO)4] [Fe(CN)6]4−

[Co(NH₃)3(H₂O)3]3+ (octahedral, [Ma₃b3]) has fac and mer isomers.

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