The manufacturer of the Little Giant Ladder runs a commercial that is 60 minutes long. The inventor of the ladder shows the versatility and uniqueness of this ladder, and several "regular" people demonstrate how easy it is to use. In fact, this ladder is more than 20 ladders in one because of the many different ways it can be configured. Viewers can call the 800 number or visit the website to purchase this product. This is an example of a(n) _____.