The following is an incomplete flowchart proving that the opposite angles of parallelogram jklm are congruent: which reasons can be used to fill in the numbered blank spaces? (1 point) 1. alternate interior angles theorem 2. corresponding angles theorem 1. corresponding angles theorem 2. alternate interior angles theorem 1. alternate interior angles theorem 2. same-side interior angles theorem 1. corresponding angles theorem 2. same-side interior angles theorem