For which of the following set of functions dependencies does the relation $R(A, B, C, D)$ has $AB, CD$ as closed sets? $A \rightarrow B, B \rightarrow A, C \rightarrow D$ $A \rightarrow B, B \rightarrow C, C \rightarrow D, D \rightarrow A$ $A \rightarrow B, B \rightarrow A, C \rightarrow A, D \rightarrow A$ $A \rightarrow B, B \rightarrow A, C \rightarrow D, D \rightarrow C$

asked
Dec 25, 2015
in Databases
shiva
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