Which of the Following Statements Is True of Internal Marketing

Which of the following statements is true of internal marketing?

A) Internal marketing is applicable only to the employees of goods manufacturers and not of service firms.
B) The quality of a firm's employees is an important part of building long-term relationships with customers.
C) Customers are treated as potential employees as they become the delivery vehicle of the purchased products.
D) Different manufacturers exchange goods internally in an attempt to curb a negative competitive spirit.