Google Ads follow the Media Rating Council’s standards for viewability. What's required for an ad to be counted as a viewable impression?

The correct answer states that an ad must be more than 50% on screen for more than two seconds to be counted as a viewable impression, according to Media Rating Council (MRC) standards for display ads. This is the industry-standard definition adopted by Google Ads to ensure that an ad has a reasonable opportunity to be seen by a user. The other options are incorrect because they either require a higher percentage of the ad to be on-screen (75%) or a longer duration (five seconds), which do not align with the established MRC guidelines for display viewability.