The marketing managers at Omaha Steaks used airlines' databases to mail a special offer to frequent flyers. Eight weeks after shipping the steaks to the frequent flyers who placed orders as a result of the initial offer, the company's salespeople followed up by telephoning customers to ask for new orders. This is an example of which two types of non-store retailing? a. direct mail and telemarketing b. direct selling and telemarketing c. telemarketing and online retailing d. online retailing and automatic vending