Question: If { A , B } { C , D } is the only functional dependency that holds for relation R ( A , B

If {A,B}{C,D} is the only functional dependency that holds for relation R(A,B,C,D), then: {A,B} is a candidate key for R
No two tuples in R can have the same values for both A and B
{A,B} is the primary key of R
All of the above
If { A , B } { C , D } is the only functional

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