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D. Target CPM

Target CPM (tCPM) bidding optimizes bids to maximize impressions within the target cost per thousand impressions.

This ensures the campaign reaches a broad audience relevant to the brand awareness goal.

C. They'll see how many ads served to how many people and how many times, across devices and formats.Unique reach and frequency metrics provide insights into the number of unique users reached and the average number of times they saw the ads.

This helps understand the effectiveness of the campaign in reaching the target audience.

The other options describe other metrics or analyses.

A. Because inflation might cause too many impressions of the same ads to serve to the same users.

Inflating the tCPM bid can lead to excessive frequency, where the same users see your ads too many times, resulting in ad fatigue and potential annoyance.

While option B is also a potential issue, option A is the primary reason to avoid inflating tCPM.