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

Multiple Choice

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

A) $\frac{z+m}{z-m}$

B) $\frac{z+m}{m}$

C) $\frac{z-m}{z}$

D) $\frac{z+m}{z}$