temperature of the beaker decreases. What do these observations tell us about the signs of $H_{soln}$ for forming aqueous solutions of each solid?

$H_{soln}>0$ when the solute is $A{x}_2$ and $H_{soln}<mn\; id="EditorElement\_4374150">0</mn>$ when the solute is $D{Z}_2$

$H_{soln}<mn\; id="EditorElement\_4374059">0</mn>$ when the solute is $A{x}_2$ and $H_{soln}>0$ when the solute is $D{Z}_2$

$H_{soln}<mn\; id="EditorElement\_4373873">0</mn>$ when the solute is $A{x}_2$ and $H_{soln}<mn\; id="EditorElement\_4373778">0</mn>$ when the solute is $D{Z}_2$

$H_{soln}>0$ when the solute is $A{x}_2$ and $H_{soln}>0$ when the solute is $D{Z}_2$