d$2$dx$2(4$x$$sec$$x$)$dx$2$d$2(4$x$$sec$$x$)=$

A$\mathrm{.}8$sec$$x$$tan$$x$+4$x$$sec$$x$($tan$2$x$+$sec$2$x$)8$sec$$x$$tan$$x$+4$x$$sec$$x$($tan$2$x$+$sec$2$x$)$

B$\mathrm{.}8$sec$$x$$tan$$x$+4$x$$sec$$x$$tan$$x$+4$x$$sec$2$x$8$sec$$x$$tan$$x$+4$x$$sec$$x$$tan$$x$+4$x$$sec$2$x

C$\mathrm{.}4$sec$$x$$tan$$x$+4$x$$sec$$x$($tan$2$x$+$sec$2$x$)4$sec$$x$$tan$$x$+4$x$$sec$$x$($tan$2$x$+$sec$2$x$)$

D$\mathrm{.}8$sec$$x$$tan$$x$+4$x$$sec$$x$$tan$2$x$8$sec$$x$$tan$$x$+4$x$$sec$$x$$tan$2$x

E$\mathrm{.}4$sec$$x$$tan$$x$+8$x$$sec$$x$$tan$2$x$4$sec$$x$$tan$$x$+8$x$$sec$$x$$tan$2$x