To indicate that line segment AB is the perpendicular bisector of line segment CD at point P, the correct choice is:
AB ⊥ CD and CP ≅ DP
This indicates that AB is perpendicular to CD and that the segments CP and DP are congruent (i.e., they are equal in length), which is the definition of a perpendicular bisector.
If you are looking for a choice that emphasizes these points exactly as they are defined, please ensure the selection presents this information correctly.