If h is the function given by h$($x$)=($f$$g$)($x$)$h$($x$)=($f$$g$)($x$)$ where f$($x$)=$xx$$ and g$($x$)=($x$)3($x$)3,$ then h$($x$)=$ A$.$xx$$ B$.$x$3$x$3$ C$.$x$34$x$43$ restricted to the domain x $0.$ D$.$x$2$x$2$ E$.$x$2$x$2$ restricted to the domain x $0.$