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Consider the relation $R(A, B, C, D, E)$ with the set of function dependencies: $F = \{ AB \rightarrow C, \ \   D \rightarrow E, \ \  A \rightarrow D \}$  The candidate Key is _____

  1. BC     
  2. AB    
  3. BAC     
  4. AD
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CAN  someone please explain what does  B-→ C means???
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