基于内容的推荐系统翻译为____________。 A: Content-based recommender systems B: Collaborative Filtering based recommender systems C: User-based Recommendation D: Item-based Recommendation

Among the four candidates, which is not used by the trustworthy content recommendation of PSNTrust for content reputation evaluation? A: The votes provided by recommender nodes. B: The number of collected recommendations. C: The recommender node trust values certified by the TS. D: The personalized node reputation.