Which of the following website design guidelines have been recommended by Google?
a. Having a clear hierarchy and text links
b. Every page should be reachable from at least one static text link
c. If the site map is larger than 100 or so links, you should break the site map into separate pages
d. Keeping the links on a given page to a reasonable number (fewer than 100)
e. Use less than 30 images or graphics per page