George believes that internal marketing is important for a goods manufacturing firm. However, Erick believes that internal marketing is more critical for a service firm than a goods firm. In this case, Erick's belief is most likely to be true because a. service firms offer tangible services to customers. b. service firms have consistent inputs and outputs. c. employees in service firms deliver the brand promise directly to customers. d. employees in service firms play an insignificant role in building relationships with customers.