If employees at LevelTech are "caught in the act" of doing good work, they receive a $100 prepaid debit card. The managers all have a number of these cards, and they can hand them out whenever they want to. Employees never know when one of the managers may drop by and "catch" them. Which type of reinforcement schedule is being used in this company? a. Variable-interval b. Fixed-interval c. Variable-ratio O d. Punishment O e. Extinction