EFGH is a parallelogram. Select the true statements used to prove that opposite angles of a parallelogram are congruent. Select two. H 8 Y E F G AEFHAGHF by the angle-side-angle congruence criterion Za Z6 because alternate interior angles are congruent when a transversal crosses parallel lines Za Zy because same-side interior angles are congruent when a transversal crosses parallel lines AEFH AGHF by the side-angle-side congruence criterion