Given ∠7≅∠9 , which lines, if any, must be parallel based on the given information? Justify your conclusion. Multiple choice answers:

Multiple choice answers:enter image source here
1) a∥b, Converse of the Alternate Exterior Angles Theorem

2) c∥d, Converse of the Same-Side Interior Angles Theorem

3) a∥b , Converse of the Alternate Interior Angles Theorem

4) not enough information to make a conclusion