For the  two hypothetical slightly soluble salts PQ and  $A{B}_2$  have same $K_{sp}$ value of    $1.6\times {10}^{-17}$. Which of the following statement regarding solubility of both the salts is true?

As  $K_{sp}$  is same, solubility of both the salts are same. 

As   $K_{sp}$ value is positive, both the salts are 100% insoluble.

Salt PQ is more soluble than $A{B}_2$

Salt $A{B}_2$  is more soluble than PQ