Robert, a highly experienced software engineer, joins a new company as the manager of a large group of employees. In his first meeting with the employees of the new organization, he explains his expectations on the behavior of employees. He also lets the employees know that noncompliance with his norms will result in withholding the rewards that they receive. Which of the following types of power is Robert using here?

a. reward
b. transformational
c. referent
d. coercive