Which statement explains how you could use coordinate geometry to prove that quadrilateral ABCD is a square? Shape ABCD is shown. Point A is at negative 3, 5. Point B is at 1, 7. Point C is at 3, 3. Point D is at negative 1, 1.

Prove that all sides are congruent, and the slopes of consecutive sides are opposite reciprocals
Prove that segments AD and AB are congruent and parallel
Prove that opposite sides are congruent and that the slopes of consecutive sides are equal
Prove that segments BC and CD are congruent and parallel