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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