What is the first step to construct a line parallel to passing through an external point m, using only a compass and a straightedge?
a. place the compass needle at any point on and set the compass width to m.
b. place the compass needle at m and using sufficient compass width mark two arcs across .
c. draw a line through m that intersects and mark the point of intersection.
d. using a convenient compass width, mark two arcs through m centered at any point on .