What problem is most likely faced by an advertiser who works through an ad network?

Name: What problem is most likely faced by an advertiser who works through an ad network?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Advertisers who work through an ad network may struggle with accurately tracking ad traffic and costs, as the network may have multiple sources for ad placement and may use different pricing models. This can make it difficult for the advertiser to calculate their return on investment and adjust their strategy accordingly.

What Problem Is Most Likely Faced by an Advertiser Who