Which of the following statements about Google's technical and quality guidelines are true?
a) It is advantageous if your web server supports the If-Modified-Since HTTP header
b) If using dynamic pages, it helps to keep the parameters short and the number of them few
c) Avoid using robots.txt to prevent crawling of search results pages or other auto-generated pages, even if they don't add much value for users coming from search engines
d) Submitting new pages of your website at http://www.google.com/addurl.html as soon as they are online, helps to speed up indexing
Answer - B
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