Answer:
A) direct-mail marketing
Step-by-step explanation:
Direct mail includes a wide range of promotional materials, such as pamphlets, brochures, postcards, bulletins, and letters of sale.
Large companies understand that direct mail marketing is among the most efficient and productive ways of reaching existing and future customers. Unlike many other forms of advertising, where you're never certain who gets your post, direct mail allows you to connect with your intended audience one-on -one.
It helps you to monitor who is getting the letter, when it is sent, what is in the envelope and how many individuals you are reaching.