In data warehousing, at which point is it important that data copies are deleted after the data is transferred?
A. Moving the data from the staging area to the warehouse
B. Extracting the data from its source
C. Moving the data from the warehouse to the data mart
D. Moving data from the source to the staging area
A
Explanation : Access should be strictly controlled and polices should exist for deleting data copies or versions after the data leaves the staging area.
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