Joe uses the following steps to construct a perpendicular line through a point C on a line segment.

Step 1: From point C, draw an arc intersecting the line segment in points A and B.
Step 2: Use a straightedge to draw an arc from point A, one above and the other below the line.
Step 3: Without changing the compass width, draw two arcs from point B, above and below the line segment.
Step 4: Label the point of intersection of the arcs above the line segment as Q and below the line as R.
Step 5: Using a straightedge, join points Q and R.

Part A: Which is the first incorrect step?

Question

Joe uses the following steps to construct a perpendicular line through a point C on a line segment.
 
Step 1:  From point C, draw an arc intersecting the line segment in points A and B.
Step 2:  Use a straightedge to draw an arc from point A, one above and the other below the line.
Step 3:  Without changing the compass width, draw two arcs from point B, above and below the line segment.
Step 4: Label the point of intersection of the arcs above the line segment as Q and below the line as R.
Step 5: Using a straightedge, join points Q and R.
 
Part A: Which is the first incorrect step?