Why is a pen/marker placed against the client’s arch during the wall ankle mobilization drill?/2022

Why is a pen/marker placed against the client’s arch during the wall ankle mobilization drill?

1. TO PROMOTE PRONATIONSINCE IT’S A COMMON COMPENSATION
2. TO RESTRICT PRONATIONSINCE IT’S A COMMON COMPENSATION
3. TO KEEP THE BASE OF THE BIG TOE OFF THE GROUND
4. NONE OF THE ABOVE