Which of the Following Is True of Google's Discounting Scheme

Multiple Choice

Which of the following is true of Google's discounting scheme for advertisers?

A) Advertisers get incremental discounts on their original CPC for every thousand clicks.
B) Advertisers pay the average CPC of all those displayed ads that are ranked below their ad.
C) Advertisers pay only ninety percent of their original CPC rate for every thousand clicks.
D) Advertisers pay one cent more than the minimum needed to retain an ad's position on a page.
E) Advertisers pay the equivalent of the CPC bid by the worst performing ads, taken in a reverse sequence.