What Does an Outdoor Advertiser Buy When It Buys a 100

What does an outdoor advertiser buy when it buys a 100 showing?

A) It is buying 100 percent of the billboards owned by that particular outdoor advertising company within the specified area.
B) It has been guaranteed that 100 percent of the population will be exposed to its outdoor advertising daily.
C) It is paying 100 percent of the rate card price for as many panels as it chooses to utilize.
D) It is buying 100 panels for a contract period of time.
E) It is having its message displayed on as many panels as needed to provide a daily exposure equal to 100 percent of the market's population.