Joe has a goal to run a 5k in the spring. His objective is to run 30 minutes, 3 times per week. Which of the following would be an appropriate self-management contingency?

a. Joe puts his running shoes next to the frontdoor.
b.Joe has to pay his friend $5 at 10:00pm on Sunday for every day that he runs less than three times per week.
c. Both of these are appropriate self-management strategies
d. None of these are appropriate self-management strategies