Let f$($x$)$ and g$($x$)$ be differentiable functions.$$ Which of the following is equal to ddx$[$f$($x$)$g$($x$)]?$

Group of answer choices

f$($x$)$g$($x$)$g$($x$)$f$($x$)[$g$($x$)]2$

f$($x$)$g$($x$)$

g$($x$)$f$($x$)+$f$($x$)$g$($x$)[$g$($x$)]2$

g$($x$)$f$($x$)$f$($x$)$g$($x$)[$g$($x$)]2$