A is corrent because a data warehouse is an approach to online analytical processing that combines data into a subject-oriented, integrated collection of data used to support management decision-making processes.
B is incorrect because a data warehouse may or may not be associated with decentralized processing.
C is incorrect because on-line transaction processing involves day-to-day transaction processing operations.
D is incorrect because the term essential information batch processing is vague, and is not ordinarily associated with a data warehouse.
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