Answer: Direct mail
Explanation: Direct mail enables an advertiser to reach target customers through mail, thereby making it a selective and specific medium. Media vehicles in direct mail include manuals, booklets, catalogues, newsletters, invitations, posters, coupons, and charts. To send out mailers, however, an advertiser needs to have an updated list of target contacts. Direct mail is a cheap advertising medium, and its advantage is that mailers can contain a lot of information. It also includes a feedback option in the form of reply cards to prompt customers to respond.