Simplify the Expression, Using Only Positive Exponents in Your Answer $\frac{x^{-9}+y^{-9}}{x^{-1}+y^{-1}}$

Multiple Choice

Simplify the expression, using only positive exponents in your answer.
- $\frac{x^{-9}+y^{-9}}{x^{-1}+y^{-1}}$

A) $\frac{y^{9}+x^{9}}{x^{8}+y^{8}}$

B) $\frac{y^{9}+x^{9}}{x^{8} y^{9}+x^{9} y^{8}}$

C) $\frac{1}{x+y}$

D) $\frac{1}{x^{8}+y^{8}}$