Silver nitrate is added to a neutral solution of a sodium salt and a yellow precipitate forms, which dissolves in both dilute $\mathrm{HNO}{}_3$ and aqueous $\mathrm{NH}{}_3$. The precipitate is

1. A$\mathrm{Ag}{}_3\mathrm{PO}{}_4$
2. B$\mathrm{AgCl}$
3. C$\mathrm{AgI}$
4. D$\mathrm{AgBr}$