Given that line segment \( AC \) is a perpendicular bisector of segment \( BD \) and that they intersect at point \( E \), we can establish several properties based on the definition of a perpendicular bisector.
- Since \( AC \) is the perpendicular bisector of \( BD \):
- \( E \) is the midpoint of \( BD \).
- This means that \( BE \) is equal in length to \( DE \).
Given this information, we can conclude:
- \( BE = DE \) (since \( E \) is the midpoint of \( BD \))
This leads us to the correct response to the question regarding segment \( BE \):
It must be the same length as segment \( DE \).