Salt $\mathrm{XA}$ (1:1 type) has $K_{sp}=2.5\times 10^{-11}$ and salt $\mathrm{YB}{}_2$ has $K_{sp}=3.2\times 10^{-14}$ at the same temperature. Which statement is correct?

1. A$\mathrm{YB}{}_2$ is more soluble than $\mathrm{XA}$ even though its $K_{sp}$ is smaller
2. B$\mathrm{XA}$ is more soluble because its $K_{sp}$ is larger
3. CBoth have equal solubility because both are sparingly soluble
4. D$\mathrm{XA}$ is more soluble since $s=K_{sp}^{1/3}$ for both salts