Based on the business strategy and situation described here, the coasters used by the Roberts group printed up are known as advertising specialty
Advertising specialty is a term that is used to describe promotional merchandise, which usually comprises goods branded with a company or brand's logo or slogan and disseminated at little or no cost to promote a brand, corporate identity, or event.
In this case, given that Robert's group printed up 500 coasters with their company logo on them to give away at the seminar. These coasters are promotional merchandise and are an example of an advertising specialty.
Advertising specialty has been a good and effective promotional merchandise used by various business firms to promote or advertise their products and services.
Hence, in this case, it is concluded that the correct answer is advertising specialty.
Learn more about Advertising Specialty here: https://brainly.com/question/14227087
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