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Collaborative filtering is (check all that apply)

A. used by online retailers and movie streaming sites to censor information
B. based on information about ones preference and that of others.
C. a way to help an individual focus on best choices when deciding what to watch or buy.
D. used by ISP's to filter out email SPAM

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Collaborative filtering is (check all that apply)

A. used by online retailers and movie...
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