When Betty visits a website that sells CDs, she is greeted with a list of current CDs the marketer thinks she would like based on her previous purchases and purchases of customers whose likes in music seem to parallel hers. This is an example of:

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Collaborative filtering is a technique used by websites to recommend products to a user based on the history of that user's preferences and the preferences of other users with similar interests. In this scenario, the website is using Betty's previous purchases and the purchases of similar customers to suggest CDs, which is a classic example of collaborative filtering.

When Betty Visits a Website That Sells CDs, She Is