What is being constructed based on the markings in the following diagram?
Line AB and line CD intersecting at E, point E between points A and B on line AB and points C and D on line CD, circle drawn with center E and radius of ED, and circle of the same radius drawn with center C.
A) Inscribed regular hexagon
B) Inscribed equilateral triangle
C) Parallel lines
D) Perpendicular lines
