[Solved] Which of the following is true of three-tier data warehouses

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Q.	Which of the following is true of three-tier data warehouses
A.	Once created, the data marts will keep on being updated from the data warehouse at periodic times.
B.	Once created, the data marts will directly receive their new data from the operational databases.
C.	The data marts are different groups of tables in the data warehouse.
D.	A data mart becomes a data warehouse when it reaches a critical size.
Answer» A. Once created, the data marts will keep on being updated from the data warehouse at periodic times.

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