For the given functions $f$ and $g,$ find the requested function and state its domain.

$f(x)=\sqrt[\phantom{2}]{x}$;$g(x)=5x-4$

Find $\frac{f}{g}.$

$(\frac{f}{g})(x)=\frac{\sqrt[\phantom{2}]{x}}{5x-4}$;$\{x|x0\}$

$(\frac{f}{g})(x)=\frac{5x-4}{\sqrt[\phantom{2}]{x}}$;$\{x|x0\}$

$(\frac{f}{g})(x)=\frac{\sqrt[\phantom{2}]{x}}{5x-4}$;$\{x|x\frac{4}{5}\}$

$(\frac{f}{g})(x)=\frac{\sqrt[\phantom{2}]{x}}{5x-4}$;$\{x|x0,x\frac{4}{5}\}$