Given a relation R(A,B,C,D). Which of the followings is trivial?

Given a relation R(A,B,C,D). Which of the followings is trivial?

Given a relation R(A,B,C,D). Which of the followings is trivial? 



a. A->AB
b. A->->AB
c. A->BCD
d. A->->BCD





Answer: D


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