What are the standard dimensions of a leaderboard ad?
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Correct answer: 728 x 90.
Why this is the answer
The standard dimensions for a leaderboard ad are 728 x 90 pixels. This is a widely recognized and supported ad size across various ad networks and platforms, making it a common choice for advertisers. Let's look at why the other options are incorrect: 250 x 300 is not a standard leaderboard size; it's closer to a medium rectangle or half-page ad. 90 x 728 is an incorrect orientation; the width should be greater than the height for a leaderboard. 300 x 250 is the standard size for a medium rectangle ad, not a leaderboard.
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