Paul is the groundskeeper for a golf course. He not only mows the greens and fairways but is also an expert on the grass that is used and how to care for it. The golf pro and club manager consult with him about what new equipment the club needs to maintain the greens. Paul plays the role of a(n) ________ in the buying process. A) market maven B) user
C) decider
D) opinion leader
E) gatekeeper