Two parallel lines l and m are cut by a transversal t. The angles are numbered as follows: at line l – ∠1 (upper left), ∠2 (upper right), ∠3 (lower right), ∠4 (lower left); at line m – ∠5 (upper left), ∠6 (upper right), ∠7 (lower right), ∠8 (lower left). Which pair of angles is an example of alternate exterior angles?
a) (3,7)
b) (2,8)
c) (1,8)
d) (1,2)