Compute the derivative of the function:

f$($x$)=($x$+1$x$1)5$f$($x$)=($x$+1$x$1)5.$

Select one:

a$.$

$5($x$+1$x$1)45($x$+1$x$1)4$

b$.$

$10$x$($x$+1)4($x$1)610$x$($x$+1)4($x$1)6$

c$.$

$10($x$+1)4($x$1)610($x$+1)4($x$1)6$

d$.$

$10($x$+1)4($x$1)6$