Which of the following statements about group III are correct?

1. A$\mathrm{Al}(\mathrm{OH}){}_3$ dissolves in excess $\mathrm{NaOH}$ to give $[\mathrm{Al}(\mathrm{OH}){}_4]{}^{-}$
2. B$\mathrm{Fe}{}^{3+}$ gives a deep blue precipitate with $\mathrm{K}{}_4[\mathrm{Fe}(\mathrm{CN}){}_6]$
3. C$\mathrm{Cr}(\mathrm{OH}){}_3$ is converted to yellow chromate by $\mathrm{NaOH}$ and $\mathrm{H}{}_2\mathrm{O}{}_2$
4. D$\mathrm{Fe}(\mathrm{OH}){}_3$ dissolves in excess $\mathrm{NaOH}$ to give a clear solution of $[\mathrm{Fe}(\mathrm{OH}){}_4]{}^{-}$