The figure below shows parallel lines cut by a transversal: which statement is true about ∠1 and ∠2? a) ∠1 and ∠2 are congruent because they are a pair of vertical angles. b) ∠1 and ∠2 are congruent because they are pair of corresponding angles. c) ∠1 and ∠2 are complementary because they are a pair of vertical angles. d) ∠1 and ∠2 are complementary because they are pair of corresponding angles.