In the Context of Personalization Technology,what Is the Drawback of Collaborative

Multiple Choice

In the context of personalization technology,what is the drawback of collaborative filtering (CF) ?

A) Collaborative filtering does not work well for a single product category.
B) Collaborative filtering needs a large sample of users and content to work well.
C) Collaborative filtering can accept inputs from only one data source at a time.
D) Collaborative filtering is useful for making recommendations across unrelated categories.