In a database system,the duplication of data items is referred to as（  ）。Which two words correctly completes this sentence?
　　A.Data independence
　　B.Data integrity
　　C.Data integration
　　D.Data redundancy
　　【Answer】D
　　【Rationale】Data independence is the independence of data items from the programmes which access them.Data integrity is the accuracy and consistency of data.Data integration refers to the ease with which applications access the central pool of data.
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