Which complex has a metal ion with an oxidation state equal to the number of unidentate ligands?

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[Co(NH₃)3Cl₃] Correct [Ni(NH₃)4]2+ [Cu(H₂O)4]2+ [Fe(H₂O)6]3+

In [Co(NH₃)3Cl₃], Co is +3 and there are 3 unidentate NH₃ ligands.

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