Express Using Positive Exponents $\frac{1}{x^{-m}}$ A) $\frac{1}{x^{m}}$ B) $x^{m}$ C) $\mathrm{mx}$ D) $x^{-m}$

Express using positive exponents. Then simplify.
- $\frac{1}{x^{-m}}$

A) $\frac{1}{x^{m}}$
B) $x^{m}$
C) $\mathrm{mx}$
D) $x^{-m}$