Operational and Informational Systems Are Generally Separated Because of Which

Operational and informational systems are generally separated because of which of the following factors?

A) A data warehouse centralizes data that are scattered throughout disparate operational systems and makes them readily available for decision support applications.
B) A properly designed data warehouse adds value to data by improving their quality and consistency.
C) A separate data warehouse eliminates contention for resources that results when informational applications are confounded with operational processing.
D) All of the above

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