My daughter in law drives a 2000 caravan with 17" wheels. Is there a way to determine which size rotors this unit has on it?

They live 2 hours away and I am traveling to do a brake job this weekend. I'd like to order the parts in advance but it seems there are 2 different possibilities for size. 10.1 inch and 11.1 inch diameter. I am leaning toward believing the larger (11.1 inch or 282 mm) is the one to go with.

Thank you in advance for any help or thoughts!