The figure below shows two parallel lines cut by a transversal: A pair of parallel lines is shown with arrowheads on each end. A transversal cuts through these two lines. An angle formed between the top parallel line and the transversal on the outer right side is marked 1. Another angle formed between the top parallel line, and the transversal on the inner right side is marked 2.

Which statement is true about ∠1 and ∠2?

∠1 and ∠2 are complementary, because they are a pair of adjacent angles.
∠1 and ∠2 are supplementary, because they are pair of adjacent angles.
∠1 and ∠2 are complementary, because they are a pair of corresponding angles.
∠1 and ∠2 are supplementary, because they are pair of corresponding angles.