Which of the following statements are correct with reference to ferrous and ferric ions ?

Options

A. `Fe^(3+)` gives brown colour with potassium ferricyanide
B. `Fe^(2+)` gives blue precipitate with potassium ferricyanide
C. `Fe^(3+)` gives red colour with potassium thiocyanate
D. `Fe^(2+)` gives brown colour with ammonium thiocyanate.