Which of the following statements is correct for a solution saturated with `AgCl` and `AgBr` if their solubilities in moles per litre in separate solutions are `x` and `y` respectively?
A. `[Ag^(+)]=[Br^(-)]+[Cl^(-)]`
B. `[Cl^(-)] gt [Br^(-)]`
C. `[Br^(-)] gt y`
D. `[Ag^(+)] = x + y`
