A precast concrete wall section is temporarily held by two cables as shown. Knowing that the tensions in cables $BD$ and $FE$ are $340$ N and $680$ N $,$ respectively, determine:

$($a$)$ the moment about point $O$ of the force exerted by cable $BD$ at point $B,$

$($b$)$ the moment about point $O$ of the force exerted by cable $FE$ at point $F,$

$($c$)$ the perpendicular distance from point $O$ to cable $BD.$

$M(BD)x=$

$N-m$

$M(BD)y=$

$N-m$

$M(BD)z=$

$N-m$

$M(FE)x=$

$J-m$

$M(FE)y=$

$N-m$

$M(FE)z=$

$N-m$

$d=$

$m$