Consists of messages delivered through the mail; catalogs; telephone calls; direct response advertising and infomercials, in magazines or on television or radio; or through digitally-mediated communication sources such as tweets, texts, or emails.

Direct Marketing

Explanation:

Direct Marketing is also called direct response marketing is a method of communicating directly to a target customer. It is a way in which information about a product, organization or a service is presented to the selected customer ( likely buyer) without using advertising intermediary. There can be many forms of direct marketing such as Brochures  catalogs , emails , text messages, phone calls, newsletters, fliers, coupons etc.

The results of direct marketing can be measured directly as there is a direct response from the costumer. It promotes products or services to the relevant consumers with an effective presentation and fascinating offer and these are delivered through appropriate direct marketing medium. This results in a cost effective purchase. Moreover using internet for direct marketing made it convenient for marketers to measure results of direct marketing campaign by the use of websites. These website help to collect and track distributed messages to customers and number of responses from customers.

answer is c. complication