Answer:
Teaser advertising
Explanation:
Advertising refers to promotion of a product or a service using mass appealing channels such as print media, television, banners and posters.
A Teaser usually serves as a clue to what is to follow at a later stage.
Teaser advertising refers to a form of pre launch promotion wherein small , brief and obscure nature of advertisements which serve as a lead up to a bigger larger forms of advertisements later on.
The purpose behind creation of such advertisements is, the advertiser captures the interests of the viewers and arouses curiosity which connects the viewer to the product over a period.
The given case corresponds to such a form of advertising.