What is PageRank?
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The search relevancy of a page compared to the other pages in the search engine's index.
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The way Google measures how popular a given page is based on the number and quality of sites that link to it.
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The way Yahoo! measures how popular a given page is based on the number and quality of sites that link to it.
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The Alexa technology for ranking pages.
PageRank is Google's proprietary algorithm that assesses web page importance by analyzing both the quantity and quality of inbound links. It operates on the principle that valuable pages receive more links from other reputable websites. Option A describes general search relevancy, not PageRank specifically. Options C and D incorrectly attribute PageRank to Yahoo! and Alexa respectively, when it is exclusively Google's technology.