Simplify the Expression $\left(\frac{7 x^{-4}}{8 y^{-4}}\right)^{-2}$ A) $\frac{49 x^{42}}{64 y^{ 42}}$ B) $\frac{49 x^{8}}{64 y^{8}}$

Multiple Choice

Simplify the expression. Write the result without using negative exponents. (Assume all variables represent nonzero real numbers.)
- $\left(\frac{7 x^{-4}}{8 y^{-4}}\right) ^{-2}$

A) $\frac{49 x^{42}}{64 y^{ 42}}$

B) $\frac{49 x^{8}}{64 y^{8}}$

C) $\frac{64 y^{8}}{49 x^{8}}$

D) $\frac{64 x^{8}}{49 y^{8}}$