A rigid system DA is subjected to two forces at point $A$ as shown in the figure below. Given $F_{AB}=-0\mathrm{.}47i+0\mathrm{.}47j-1\mathrm{.}884k(KN)$ and $F_{AC}=-2\mathrm{.}34i+1\mathrm{.}872$k $($KN$).$

a$)$ The magnitude of moment caused by force

$F_{AB}$ about $y-$axis is KN$.$m and its direction is $$

b$)$ The magnitude of moment caused by force $F_{AC}$ about $OB$ is KN$.$m and its direction is