Which of the following refers to the marketing activity in which a firm "ambushes" consumers with promotional content in places they are not expecting to encounter this kind of activity?1. Media relations2. Corporate identity3. Sponsorships4. Ambient advertising5. Guerrilla marketing

The correct answer is choice 4, ambient advertising.

Ambient advertising is the practice of placing unusual advertisements or promotion content on items and in areas where consumers would net be expecting to see advertising. This ambient advertising may be in bathrooms, inside refrigerators, or many other areas where you would not expect to see advertising.