Which of the following combination in aqueous medium will give a red colour or precipitate ?

Which of the following combination in aqueous medium will give a red colour or precipitate ?
A. `Fe^(3+)+SCN^(-)`
B. `Fe^(2+)+[Fe(CN)_(6)]^(3-)`
C. `Ni^(2+)+` dimethyl glyoxime `+NH_(3)`
D. `CO^(2+)+SCN^(-1)`

Which of the following combination in aqueous medium will give a red colour or precipitate ?

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