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The pair of compounds having metals in their highest oxidation state is:
A. `MnO_(2) and CrO_(2)Cl_(2)`
B. `[FeCl_(4)]^(-) and Co_(2)O_(3)`
C. `[Fe(CN)_(6)]^(3-) and [Cu(CN)_(4)]^(2-)`
D. `[NiCl_(4)]^(2-) and [CoCl_(4)]^(2-)`

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