Which of the following statements is true about user agents?
A) They are also known as Web spiders.
B) They are agents that search to find the best price for a particular product a user wishes to purchase.
C) They are agents that continuously analyze large data warehouses to detect changes deemed important by a user.
D) They are agents that automatically perform a task for a user.
E) They are agents designed by spammers and other Internet attackers to farm e-mail addresses off Web sites or deposit spyware on machines.
D
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