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Consider a relation R(A,B,C,D,E) with functional dependencies A→B, B→C, C→D, D→E. What is the closure of {A}, i.e., A+?
- A{A,B}
- B{A,B,C}
- C{A,B,C,D}
- D{A,B,C,D,E}
Correct answer: D
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