In the traditional advertising model, advertisers were charged using a approach, which charged for the exposures to an ad. google transformed the traditional model to a model called where advertisers pay only when someone actually clicks on the ad and is sent to their website.

The correct answers that fills the gaps are: Cost per Thousand; Cost per Click.

Explanation:

Cost per Click (CPC), Cost per Thousand Impressions (CPM) and Cost per Acquisition (CPA) are collection methods used by digital media platforms. The CPC is calculated based on the number of clicks on the ads, the CPM for impressions, and the CPA for the number of conversions.

CPM, or Cost per thousand impressions, is a metric that represents the cost generated per thousand impressions of the ad. Obviously they are not literal impressions, but the number of times that certain advertising was displayed to the public on the internet.

By choosing CPM as a form of payment, the advertiser agrees to pay the publisher of the ad a pre-determined amount for every thousand impressions. This means that the publisher receives compensation for each ad shown, having more predictability of profit.

The cost per click is a form of payment of paid advertisements in which for a number of clicks made the payment is made. That is, the advertiser pays for visitors who access the site where the ad was made for their site.

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