Which complex is colored due to a d-d transition?

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[Ni(CO)4] [Fe(CN)6]4− [Mn(H₂O)6]2+ Correct [Co(CN)6]3−

[Mn(H₂O)6]2+ (Mn₂+, d5) in an octahedral field undergoes d-d transitions, absorbing visible light (pale pink color).

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