Question: What best describes the function of single-image ad layouts in a Discovery campaign?
- They allow Google to combine images, headlines, and descriptions into countless ad variations.
- They show one collage image comprised of many product image assets.
- They show a brief five-second preview of a company's products and services, just like multi-image carousel ads do.
- They will expand the image that your customer long-presses on.
Explanation
Google defines single image ads as an asset-based format within Demand Gen creative. A single ad can include multiple approved image assets along with headlines and descriptions, so delivery is not limited to one fixed creative. The system can adapt those assets across eligible placements and formats, which is why this layout is built for flexible assembly rather than a static image treatment. This makes the format suitable for varied feed environments and screens. Google Help+1
Why the other options are incorrect
Collage image A single image ad is not defined as one merged collage; Google treats images as separate assets within the ad. Google Help
Five-second preview Google describes video formats separately, so a brief preview is not the defining function of single image ads. Google Help
Long-press expansion Google’s format guidance does not define single image ads by long-press expansion behavior. Google Help
Source for verification
https://support.google.com/google-ads/answer/13704860?hl=en
The answer(s) to the question is highlighted in the BOLD text above. You can also find more questions and answers related to the exams on the "Google Ads Display Professional Certification" page.