To indicate that line segment \( \overleftrightarrow{AB} \) is the perpendicular bisector of segment \( \overleftrightarrow{CD} \) when they intersect at point \( P \), we need to mention two critical characteristics:
- Perpendicularity: The two lines intersect at right angles.
- Bisection: The point of intersection divides the segment \( \overline{CD} \) into two equal parts.
Considering the options you provided, the correct choice would be:
\( \overline{AB} \perp \overline{CD} \) and \( CP \cong DP \).
This indicates that \( AB \) is perpendicular to \( CD \) and that the segments \( CP \) and \( DP \) are congruent, satisfying the conditions of being a perpendicular bisector.