Question

A relation R(A,B,C,

  • D has functional dependencies A→B and B→C. Which statement follows?
A A→D must hold because A determines B and B determines C.
B C→A follows by transitivity from B→C.
C A→C follows by transitivity from A→B and B→C.
D B→A follows because A→B is reversible.
E D→C follows because D is absent from the dependencies.
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