A plum is located at coordinates $(-7\mathrm{.}72$ m$,$ O$,3\mathrm{.}95$ m$).$ In unit$-$vector notation, what is the torque about the

origin on the plum if that torque is due to a force F whose only component is $($a$)$ Fx $=9\mathrm{.}00$ N$,($b$)$ Fx $=-9\mathrm{.}00$ N$,$

$($c$)$ Fz$=9\mathrm{.}00$ N$,$ and $($d$)$ Fz$=-9\mathrm{.}00$ N$?$