At a ball game the guy sitting next to Sam couldn't stop talking about his new stadium chair. Anytime there was a lull in the game, he would share different features and their benefits. He never told anyone listening he was being paid by the manufacturer to promote the new stadium chair. This would be an example of which unethical marketing strategy?
1) Deceptive advertising
2) Product placement
3) Astroturfing
4) Stealth marketing