Google makes many recommendations for Google AdWords users for direct response campaigns. One of the recommendations Goo

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Google makes many recommendations for Google AdWords users for direct response campaigns. One of the recommendations Google makes is to implement cost-per-click bidding so that you only pay when people click your ad. What other reason is valid for using the cost-per-click bidding?

A. If you want to be included in Google Content Network, you must use cost-per-click bidding.
B. If you are creating a display ad, you must use cost-per-click bidding.
C. If you want to include video overlays ads, you must use cost-per-click bidding.
D. If you want to use the Conversion Optimizer tool, you must use cost-per-click bidding.