A brown precipitate from group III dissolves in dilute $\mathrm{HCl}$ giving a yellow solution that gives a blood-red colour with $\mathrm{KSCN}$ and a deep blue precipitate with $\mathrm{K}{}_4[\mathrm{Fe}(\mathrm{CN}){}_6]$. The blue precipitate, its iron content by oxidation state, is

1. A$\mathrm{Fe}{}_4[\mathrm{Fe}(\mathrm{CN}){}_6]{}_3$ containing three Fe(III) and four Fe(II)
2. B$\mathrm{Fe}{}_4[\mathrm{Fe}(\mathrm{CN}){}_6]{}_3$ containing seven Fe(II)
3. C$\mathrm{Fe}{}_4[\mathrm{Fe}(\mathrm{CN}){}_6]{}_3$ containing four Fe(III) and three Fe(II)
4. D$\mathrm{Fe}{}_3[\mathrm{Fe}(\mathrm{CN}){}_6]{}_2$ containing three Fe(II) and two Fe(III)