The figure at left was made by first drawing line segment AB, and then drawing JK, which is a segment of the perpendicular bisector of AB.
Which of the following statements must be true?
A
Triangles AJB and AKB are isosceles.
B
Triangle AKB is isosceles, but triangle AJB is not.
С
Triangles AJB and AKB are congruent.
D
Triangles AJK and AJB are congruent.