Q:Question:implemented by a relational database technique (ROLAP), by a multidimensional database technique (MOLAP), or by a hybrid database technique (HOLAP). a. Briefly describe each implementation technique. b. For each technique, explain how each of the following functions may be implemented: 1.The generation of a data warehouse (including aggregation) 2.Roll-up 3.Drill-down 4.Incremental updating d. Which implementation techniques do you prefer, and why