Below is the answer and explanation for the question the most effective way to control the number of times someone sees an ad is by: 

The most effective way to control the number of times someone sees an ad is by:

• A) Monitoring audience retention metrics with YouTube analytics
• B) Setting a lower cost-per-view (CPV) bid at the target group level
• C) Lowering bidding levels
• D) Setting a frequency cap ✅

correct answer

Setting a frequency cap ✅

explanation

Frequency is the average number of times a unique user sees your ad in a position of “1” over a given time period. Use frequency capping to help control the maximum number of times that you’d like each person to see your ad on the Display Network.
Read more here: https://support.google.com/adwords/answer/117579?hl=en

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