Question 3: a) Compare Relational Database Management Systems and Data Warehouses showing the characteristics of each system and of the data it manages. b) Mention the most important commercial Data warehouse products in the market and their market share and why? c) Compare two different architectures that are used in Data warehouses. d) Discuss the most important OLAP operations giving examples for each from a certain case study. e) Discuss the relationship of OLAP with the new term Data Analytics used nowadays