Problem 6. (15 points) Please describe each of the followin underline recommendation mechanism, (2) required input data, (3) strengths and (4) limitations (a) User-based Collaborative Filtering g recommendation ation algorithms in terms of the following criteria: (h) .Underline recommendation mechanism . Required input data: Strengths: (b) Item-based Collaborative Filtering . Underline recommendation mechanism: . Required input data: . Strengths: .Limitations: (c) Content-based Recommendation .Underline recommendation mechanism: . Required input data: Strengths: Limitations