The figure below shows parallel lines cut by a transversal:


Which statement is true about ∠3 and ∠4?

∠3 and ∠4 are congruent because they are a pair of alternate exterior angles.
∠3 and ∠4 are complementary because they are a pair of alternate exterior angles.
∠3 and ∠4 are complementary because they are a pair of alternate interior angles.
∠3 and ∠4 are congruent because they are a pair of alternate interior angles.