Two aqueous solutions are mixed: $AX$ and $A_2Y$.
- A solution containing silver ions is added drop by drop to the mixture of $AX$ and $A_2Y$.
- First, a yellow precipitate forms, and then a black precipitate forms.
- $Ag_2Y$ is yellow and $AgX$ is black.
Which of the following molar solubility rankings is possible for these laboratory observations?