Answer: B. Outdoor Media
Outdoor Media refers to any advertisement done outdoors in order to attract people's attention. It is also known as out of home advertising.
The most popular form of outdoor advertising are billboards. It also includes transit advertising where ads are displayed on trains, subways and other public transport system. Advertising at bus shelters, kiosks, benches and parking garages and street furniture and commercials at a movie theatre before the movies are also forms of outdoor advertising.
These days, there are different forms of digital outdoor advertising. These include pinging people through Bluetooth devices, and allowing people who pass by to play with the billboards.