What is a reserve ad? December 23, 2018 By CertificationAnswers What is a reserve ad? An ad provided by an established YouTube partner An ad that will be requested before auction ads An ad with the guaranteed highest CPMs An ad that will be requested if no auction ads are available Related content Related posts:Why is it important to look at the overall revenue…When do fluctuations in CPMs typically happen?Which of the following ad formats typically has the…If you saw an increase in revenue, but overall CPMs…