One of your clients wants to know why a campaign went over the specified daily budget several days in a row. What would you explain to your client about how the AdWords system works?

Due to changes in traffic, AdWords allows up to 20% more impressions in a day than the budget specifies
Due to changes in traffic, AdWords allows up to 20% more clicks in a day than the budget specifies.
To show an ad more often, AdWords charges more than the average daily budget amount multiplied by 30.4
AdWords automatically increases the maximum cost–per–click (CPC) bid to show an ad higher in Google search results

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