Sodium fusion extract, obtained from aniline, a treatment with iron (II) sulphate and `H_(2)SO_(4)` in presence of air gives a prussion blue precipitate. The blue colour is due to the formation of:
A. `Fe_(4)[Fe(CN)_(6)]_(3)`
B. `Fe_(3)[Fe(CN)_(6)]_(2)`
C. `Fe_(4)[Fe(CN)_(6)]_(2)`
D. `Fe_(3)[Fe(CN)_(6)]_(3)`