Which of the following explains the persuasive technique "joining the bandwagon?"

Buying a product because it is on sale for a limited time.

Using music, lyrics, or a catchy jingle to help sell a product.

Everyone else is buying it, so you better, otherwise you'll be left out.

Advertising on the side of vehicle to incorporate a mobile advertisement.

"Everyone else is buying it, so you better, otherwise you'll be left out."