Which of the Following Is an Example of Direct Marketing

Which of the following is an example of direct marketing?

A) E&OE sells its herbal skincare products exclusively through its standalone stores.
B) TCJ is a telemarketing firm that sells products from a number of different suppliers.
C) Jayne's sells most of its products to customers through home sales parties.
D) J3 is a storeless retailer that organizes the retail activity of the employees of four firms.
E) Reynold's tries to minimize its staff costs by installing vending machines in its stores.