Which of the following is an example of a zero-level channel (i.e. A direct marketing channel)?

A company takes online orders from customers and ships the products to them.
B. An organization uses a combination of direct salespeople and sales agencies to increase sales.
C. A company sells its products through wholesalers and retailers.
D. A company sells its products through chains of supermarkets and other large sellers.
E. A large company forms alliances with smaller companies to increase sales coverage.