Since line segment AC is the perpendicular bisector of segment BD, it means that:
- Point E is the midpoint of segment BD, which implies that \( BE = DE \).
- Segment AC is perpendicular to segment BD, meaning that angle BED is a right angle.
Based on this information, the correct statement is:
It must be the same length as segment DE.
Thus, the answer is: It must be the same length as segment DE.