According to the IAB and MRC, what is the definition of a 'viewable' display ad impression?
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A
An ad that is loaded in the browser, regardless of screen position
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B
At least 50% of the ad's pixels visible in the browser viewport for at least 1 continuous second
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C
An ad that a user actively scrolls past on a webpage
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D
An ad that loads within 3 seconds on a standard internet connection