Emily works in the sales division for Kone Elevators, a newer firm selling new elevators and associated equipment for new construction, replacement elevators for existing buildings, and supportive service contracts. Kone is challenging Otis Elevators, which is the leader in this industry and has a lot of established contacts with the construction field. Therefore, Kone wants to offer the best service possible with its salespeople. Kone Elevators sales representatives typically work closely with construction engineers and electrical contractors on new construction projects to determine the best placement and type of elevator to install to ensure efficient and safe operation. Which factor favoring the use of personal selling relates to this activity? a. Technically complex b. Long marketing channel c. Relatively high price d. Few customers