In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?

In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?
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In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest? A. ... 3+)` D. `[Co(CN)_(6)]^(3-)`
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