The addition of potassium ferrocyanide to a ferric salt gives a Prussian blue color,which is primarily due to the formation of .........

  • A
    $K_3[Fe(CN)_6]$
  • B
    $KFe[Fe(CN)_6]$
  • C
    $FeSO_4 \cdot Fe(CN)_6$
  • D
    $Fe_4[Fe(CN)_6]_3$

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