Of the four statements below, which is true? a. Expansion cards are nonvolatile memory chips that can be erased and rewritten.
b. Expansion cards are used to direct and coordinate most of the operations associated with local area network (LAN) and internet servers.
c. Expansion cards are the main circuit boards within a computer system.
d. Expansion cards are circuit boards that enhance the functions of a components of asystem unit and/or provide connections to peripherals.

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?