Which of the following demonstrates someone with integrity? a. a student who attempts to skip out of detention to meet his friends b. a used car salesman who fails to reveal to his customers that the car they want to buy has been in a serious car accident c. a student who notifies his teacher that there was a cheat sheet going around class during the final exam d. a security guard at a department store who sees an old friend walk in and begin putting articles of clothing in her purse, but decides she probably needs the clothes and lets her go