Jeffrey O'Donnell Works for a Producer of Dairy Products and Knows

Jeffrey O'Donnell works for a producer of dairy products and knows all about these products.He is responsible for only two very large chain customers.Other sales reps,like Jeffrey,call on other large chains for this producer.They regularly call on the central offices of these big retail chains and encourage them to buy the company's full line.Jeffrey is a

A) missionary salesperson.
B) retail order taker.
C) technical specialist.
D) manufacturers' agent.
E) member of his company's major accounts sales force.