With the recent surge in the showing of commercials to movie theater audiences, many companies have found it to be an innovative medium to reach large numbers of consumers. For instance, several beverage products, including sports drinks, soft drinks, and bottled water, advertise heavily in theaters, where they know a very broad and diffuse cross-section of consumers can be reached. Advertising in this medium relies on .

Self selection.

Explanation:

Marketing can be defined as the process of developing promotional techniques and sales strategies by a firm, so as to enhance the availability of goods and services to meet the needs of the end users or consumers through advertising and market research. Thus, it comprises of all the activities such as, identifying, anticipating set of medium and processes for creating, promoting, delivering, and exchanging goods and services that has value for customers. It typically, involves understanding customer needs, building and maintaining healthy relationships with them in order to scale up your business.

Advertisement refers to the promotional multimedia messages designed and developed to make the products or services of a company known to its customers and potential customers.

In this scenario, advertising relies on self selection.