Answer :
The key discovery that triggered the development of data warehouses was called the recognition of the differences between transactional systems and informational systems. So the right answer to this question is B.
A data warehouse can be described as a kind of data management system that is designed to turn on and support business intelligence (BI) activities, especially analytics. Data warehouses are only intended to show queries and analysis and often conduct large amounts of historical data. A data warehouse that contains the key discovery that triggered the development was called the recognition of the differences between transactional systems and informational systems.
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