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Given R(A,B,C,D,E,F) and S={A→C,A→D,D→E,E→F} , what is A+

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Given R(A,B,C,D,E,F) and S={A→C,A→D,D→E,E→F}, what is A+

c. {A, B, C, D, E, F}

b. {A, C}

a. {A, C, D}

d. {A, C, D, E, F}

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