Final answer:
Around 80% of the Web's information is part of the Deep Web, which is not indexed by standard search engines. The Surface Web comprises the indexed and publicly accessible content.
Step-by-step explanation:
Approximately 80% of the information on the Web belongs to the 'c) Deep Web'. The Deep Web refers to the content on the internet that is not indexed by standard search engines and therefore cannot be found through traditional search methods. It includes pages that are behind paywalls, require sign-ins, or are simply not linked to by other pages. The Surface Web, on the other hand, consists of websites and pages that are indexed by search engines and are readily accessible to the public. The Invisible Web and the Open Web are terms that can sometimes be used interchangeably with the Deep Web and the Surface Web, respectively, but less commonly so.