Smart tips for selling to business customers include all the following except: a. Emphasize various benefits that meet the differing needs and interests of each member of the buying center b. Offer fresh insight and ideas in e-mails and other correspondence c. Develop a marketing mix to satisfy the needs of the organization as well as the needs of individual purchasing managers d. Show appreciation by offering desirable gifts to purchasing managers e. Explain how products and services will reduce the firm's risk