What is the mobile-first index?
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Correct answer: A ranking system that looks at the mobile version of a page to evaluate its relevance to the user.
Why this is the answer
The mobile-first index means Google primarily uses the mobile version of a website's content for indexing and ranking. This reflects the reality that most users access Google via mobile devices. Therefore, Google evaluates the relevance and quality of a page based on its mobile presentation. Option B is incorrect because it's not just about which version is crawled first, but which version is used for ranking. Option C is incorrect because it doesn't inherently give ranking priority to mobile websites; rather, it prioritizes the mobile version of a site's content for evaluation, meaning a well-optimized mobile site will perform better.
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