Answer completely and carefully based on web services for thumbs up.

True or false with small reasoning.

a) The World Wide Web is a collection of structured data items connected to each other by well-defined relations. b) Web robots are detected when they download the robots.txt file from a web site. c) HTML documents are the best media type for creating a semantic web. d) A website server can detect crawlers by their quick successive requests to the server. e) A parts of speech tagger is trained using large collections of documents that have been manually labelled. f) The crawler's request queue represents the frontier of the crawling process. g) A search engine must give text tagged as boldface higher score as a search keyword. h) In a search engine, the lexical analyser creates a Document Object Model (DOM) of the page