Drew is selling math textbooks and using cost-per-click (CPC) bidding for his campaign. What’s the final cost each time his ad is clicked?

The projected maximum cost-per-click (max. CPC)
The average amount charged each time someone clicks on his ad
The average amount needed to make the ad appear somewhere on the page
The minimum amount needed to maintain a higher rank than the rank held by the next-highest bidder in the auction

The correct answer is:

The minimum amount needed to maintain a higher rank than the rank held by the next-highest bidder in the auction