point of intersection.

$r=($:$3,1,4$:$)+t($:$3,-7,-1$:$)$

$R=($:$18,-2,16$:$)+s($:$5,-1,4$:$)$

Select the correct choice and, if necessary, fill in the answer boxes to complete your choice.

A$.$ The lines intersect at the single point $$

$$

$$

$($Simplify your answers.$)$

B$.$ The lines intersect at all points on the line $r(t).$

C$.$ The lines are parallel.

D$.$ The lines are skew.