Carrie is reviewing the Google AdWords concept of quality score. Which of the following statements is most accurate about the quality score of an advertisement?

The higher the quality score, the higher the bid for the ad position. 

The lower the quality score, the higher the Google AdWords costs, and the better the ad po sition. 

The higher the quality score, the lower the Google AdWords costs, and the better the ad po sition. 

The lower the quality score, the lower the Google AdWords costs.