Which of the following best describes a document on the World Wide Web?

A document on the World Wide Web is best described as a web page viewable by internet users because it refers specifically to the content that is hosted online and accessed through web browsers. These web pages can contain text, images, videos, and hyperlinks, making them a fundamental element of the World Wide Web. When users browse the internet, they are primarily interacting with web pages, which are structured documents written using HTML (Hypertext Markup Language) and often styled with CSS (Cascading Style Sheets). This accessibility and interactivity are what define web pages, as they are designed to be easily navigable by individuals using web-enabled devices.

Other options describe elements that are not central to the concept of web documents. For example, a book available for purchase refers to physical or digital books, which do not encapsulate the essence of web documents. A type of computer virus describes malicious software that can harm systems but does not relate to standard web documents. Lastly, a server location refers to the physical or logical location of a server where data is hosted, rather than the document itself. Thus, the description of a web page perfectly encapsulates what a document on the World Wide Web represents.