Ian is bisecting segment CD. First, Ian places the compass on point D, opens it to a width larger than half of the segment, and swings an arc on both sides of segment CD. Then, Ian keeps the compass the same width and places it on the other point C. What is the next step?

Swing arcs on both sides of segment CD to intersect the first two arcs created.
Swing an arc above line segment CD.
Swing an arc that intersects the opposite point D.
Swing an arc that intersects segment CD.