Which complex absorbs light in the visible region due to a d-d transition?

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

[Cr(H₂O)6]3+ (Cr₃+, d3) undergoes d-d transitions, absorbing visible light.

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