Which one of the following complexes is violet in colour?
- A$[Fe(CN)_{6}]^{4-}$
- B$[Fe(SCN)_{6}]^{4-}$
- C$Fe_{4}[Fe(CN)_{6}]_{3} \cdot H_{2}O$
- D$[Fe(CN)_{5}NOS]^{4-}$
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