Stephen wonders how many hours he can work on campus, off campus and during scheduled breaks per week while holding a valid study permit. What is the correct answer? a) Stephen can work unlimited hours on campus, 20 hours off campus, and unlimited hours during scheduled breaks; b) Stephen can work 40 hours on campus, 20 hours off campus and unlimited hours on schedule breaks; c) Stephen can work 20 hours on campus, 20 hours off campus and unlimited hours on scheduled breaks; d) Stephen can work 20 hours on campus, 20 off campus and 20 hours on scheduled breaks