Ambush marketing refers to companies that use the media and the public paying attention to major events, and organize activities related to major events to associate themselves with major events, thereby attracting consumers' associations and the media's attention. This type of marketing is usually hidden, sudden, did not appear as a sponsor, but quietly promoted its own brand.
According to the above definition, which of the following is not ambush marketing?
During the Formula One World Championship, people in the audience waved a colored flag with a tire company's trademark from time to time.