Buzz marketing is a way of selling a product or service experience by providing it directly to potential consumers. According to the above definitions, which of the following is not beep marketing? ['A software company launches a trial version of the software online, users can try it for free for three months.', 'A camera company hires actors to play as couples in the bustling areas of major cities, invites passersby who may become target customers to take pictures of them, and takes the opportunity to promote the features of the new camera to them.', 'An enterprise sends regular emails to users, sends product magazines, pushes discount information, and promises to return products unconditionally within one month of purchase.', 'A beverage company has marketers frequently appear in streets, cafes, bars, supermarkets, and other places, and ask passersby to taste different flavors of drinks to promote their brands.']