Question $\backslash$# $3(10$ points$)$

For the force system shown in Fig. $4,$ determine the following:

$($i$)$ the moment about point $\backslash (\backslash$boldsymbol$\{$B$\}\backslash$left$(\backslash$mathbf$\{$M$\}\_\{\backslash$mathbf$\{$B$\}\}\backslash$right$)\backslash ).$

$($ii$)$ the moment about line $\backslash (\backslash$boldsymbol$\{$C D$\}\backslash$left$(\backslash$boldsymbol$\{$M$\}\_\{$C D$\}\backslash$right$)\backslash ).$

Note that point $\backslash (\backslash$mathbf$\{$A$\}\backslash )$ lies in the y$-$z plane.

Figure $4$