Because they do so much driving while visiting doctors' offices and hospitals, pharmaceutical sales representatives are often given company cars to drive. When a pharmaceutical company like Merck is preparing to purchase new company cars, sales reps' feedback will be sought on car models and features, but the final decision will be made by higher levels of management. What role$($s$)$ do the sales reps play in the buying center? A$.$ users B$.$ initiators C$.$ influencers D$.$ users and influencers E$.$ users and initiators