The segment bisector in this scenario is the line segment or line that is perpendicular to the line segment CD¯¯¯¯¯¯¯¯ at point E and divides it into two equal parts. Given that Lexi folded her paper so that point C was on top of point D, the intersection point E indicates where the bisector meets CD¯¯¯¯¯¯¯¯.
Therefore, the correct response is:
CD¯¯¯¯¯¯¯¯