Use the Rules of Exponents to Simplify the Expression $\left(16 \frac{a^{3} b^{-4}}{a^{-1} b^{4}}\right)^{1 / 4}$

Multiple Choice

Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers.
- $\left(16 \frac{a^{3} b^{-4}}{a^{-1} b^{4}}\right) ^{1 / 4}$

A) $2 a b^{2}$

B) $\frac{4 a}{b^{2}}$

C) $\frac{2 \mathrm{a}}{\mathrm{b}^{2}}$

D) $\frac{4 b^{2}}{a}$