What does the term "invisible web" refer to?
a. the "invisible web" is a subscription service available only to libraries and schools.
b. the "invisible web" refers to a large portion of the web that regular search engines cannot find.
c. the "invisible web" is made of libraries that have scanned their books and put them online.
d. the "invisible web" is a database that can be accessed only through the library of congress.?

These factors limit the ability to attach files to e-mail messages. location of sender recipient's ability to open file size of file type of operating system used

Suppose you are an ad-serving company and you maintain a log of cookie data for ads you serve to the web pages for a particular vendor (say amazon). a. how can you use this data to determine which are the best ads? b. how can you use this data to determine which are the best ad formats? c. how could you records of past ads and ad clicks to determine which ads to send to a given ip address? d. how could you use this data to determine how well the technique you used in your answer to part c was working? e. how could you use this data to determine that a given ip address is used by more than one person? f. how does having this data give you a competitive advantage vis-à-vis other ad-serving companies?

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