Use the Law of Exponents to Rewrite and Simplify the Expression

Multiple Choice

Use the Law of Exponents to rewrite and simplify the expression. $\frac{\sqrt{a \sqrt{b}}}{\sqrt[7]{a b}}$

A) $a^{\frac{5}{14}} b^{\frac{3}{28}}$
B) $\frac{a}{b^{\frac{3}{28}}}$
C) $\frac{a}{b}$
D) $\frac{a^{\frac{5}{14}}}{b^{\frac{3}{28}}}$
E) $\left(\frac{a}{b}\right) ^{\frac{5}{14}}$