Which of the Following Is an Example of Inbound Telemarketing

Which of the following is an example of inbound telemarketing?

A) Sterrns Media utilizes interactive cable systems to enable customers to obtain product information by using their TV remotes.
B) Sterrns Media spends a lot of time and effort to train its sales force to call businesses and inform them about its B2B products.
C) Sterrns Media airs advertising programs called infomercials to attract viewers and get them to order products from its website.
D) Sterrns Media purchases customer information and later cold calls these customers to generate potential leads.
E) Sterrns Media advertises its services by sending letters to potential customers and prompting them to contact the firm through a toll-free number.