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