The complex ion that does not have d electrons in the metal atom is

The complex ion that does not have d electrons in the metal atom is
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The complex ion that does not have d electrons in the metal atom is A. `[MnO_(4)]^(-)` B. `[Co(NH_(3))_(6)]^(3+ ... ]^(3-)` D. `[Cr(H_(2)O)_(6)]^(3+)`
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