Compute the derivative of the function

f$($x$)=($x$2+$x$3)4$f$($x$)=($x$2+$x$3)4.$

Select one:

a$.$

$4($x$2+$x$3)34($x$2+$x$3)3$

b$.$

$4($x$2+$x$3)3(2$x$+1)4($x$2+$x$3)3(2$x$+1)$

c$.$

$($x$2+$x$3)3(2$x$+1)($x$2+$x$3)3(2$x$+1)$

d$.$

$4($x$2+$x$3)4(2$x$+1)$