Given $f(x)$ And $g(x)$ , Find the Indicated Composition and State Its Domain

Multiple Choice

Given $f(x)$ and $g(x)$ , find the indicated composition and state its domain.
- $f(x) =\frac{9}{x} ; g(x) =5 x^{2}$
Find $(\mathrm{g} \circ \mathrm{f}) (\mathrm{x})$ .

A) $\frac{9}{5 x^{2}}$ , all real numbers except 0

B) $\frac{5 x^{2}}{9}$ , all real numbers

C) $\frac{405}{x^{2}}$ , all real numbers except 0

D) $\frac{5 x^{2}}{81}$ , all real numbers