James is constructing a circle circumscribed about a triangle. he has partially completed the construction, as shown below. what should be his next step in the construction?

triangle def is shown with two sets of intersecting arc markings on either side of side ef. a line segment is drawn through each set of intersecting arc markings and through side ef. another segment is drawn through side de and two more sets of intersecting arc markings.

connect the arc markings to angle e to find another bisector
use the compass to find the perpendicular bisector for side df
connect three arc markings to determine the vertices form the triangle
use the circumcenter to determine the center of the circle