Breaking up a Web page into its components to identify worthy words/terms and indexing them using a set of rules is called * O preprocessing the documents. document analysis. creating the term-by-document matrix. O parsing the documents. . What does Web content mining involve? * analyzing the universal resource locator in Web pages analyzing the unstructured content of Web pages analyzing the pattern of visits to a Web site O analyzing the PageRank and other metadata of a Web page What does Web structure mining involve? * analyzing the universal resource locators in Web pages analyzing the unstructured content of Web pages analyzing the pattern of visits to a Web site analyzing the PageRank and other metadata of a Web page Web site usability may be rated poor if * the average number of page views on your Web site is large. the time spent on your Web site is long. Web site visitors download few of your offered PDFs and videos. users fail to click on all pages equally