The first step in the construction of a perpendicular bisector involves taking a compass and drawing two arcs from points A and B on line segment AB to intersect above and below the midpoint.
Based on your descriptions, the correct response is:
A line segment has 2 end points, A and B. Two arcs, one open to the left and one to the right, are bisected by the line segment A B to the right of its center and left of its center, respectively.
This describes the initial step where you would set a compass to a width greater than half the distance between points A and B to draw the arcs.