How many ad sizes are there on the GDN?
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Correct answer: 25.
Why this is the answer
The correct answer is 25. The Google Display Network (GDN) supports 25 standard ad sizes for image and rich media ads. While advertisers can create ads in various dimensions, Google recommends focusing on the most effective sizes for broader reach and better performance. These 25 sizes cover a wide range of placements across websites and apps within the GDN. Options like 10, 20, and 30 are incorrect as they do not reflect the current number of standard ad sizes supported by the GDN.
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