"Before someone tells you in no uncertain impolite terms where to take LL questions and in what bodily cavity they should be placed:
Please take all LL questions to
http://www.eteamz.com otherwise known as sleazeteamz.
Believe me, I was much nicer that they would be."
That was just rude, and uncalled for. If you don't know the answer to this question just let it go.
The answer is none of the above.
The pitcher being on the rubber, or pitchers plate, does not preclude the runners from advancing in LL majors and below. If the pitcher is on the plate, AND the catcher is ready to recieve the pitch (facing the pitcher with all gear in place) AND the runners are not advancing, THEN the runners must return to the last base held. If not, then they are in violation of rule 7.13 IF a pitch is delivered.
Don't let a few LL haters preclude you from using this forum. LL rules are different, and difficult for some to comprehend.