Rewrite the Radical Expression Using Rational Exponents $\sqrt{\mathrm{x}^{9}}$ A) $x 9 / 2$

Multiple Choice

Rewrite the radical expression using rational exponents. A ssume all variables represent nonnegative real numbers.
- $\sqrt{\mathrm{x}^{9}}$

A) $x 9 / 2$
B) $-x^{2 / 9}$
C) $x^{-2 / 9}$
D) $x^{-9 / 2}$