Which of these are examples of signal inputs that can used within a clean room?
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Correct answer: Campaign impression logs.
Why this is the answer
Amazon Marketing Cloud uses privacy-safe event-level advertising signals for analysis. Impression activity is a valid media signal because it records ad exposure that can be connected to downstream events in aggregated outputs. These signals help answer measurement questions such as reach, overlap, and path to conversion. Clean room workflows depend on available connected datasets rather than unrelated business reports.
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