The solubility product for a salt of the type $AB$ is $4 \times 10^{-8}$. What is the molarity of its saturated solution?

  • A
    $4 \times 10^{-4} \ mol/L$
  • B
    $2 \times 10^{-4} \ mol/L$
  • C
    $16 \times 10^{-16} \ mol/L$
  • D
    $2 \times 10^{-16} \ mol/L$

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