For Any Relation R, If, for Every Valid Instance of A

Multiple Choice

For any relation R, if, for every valid instance of A, that value of A uniquely determines the value of B:

A) then a primary dependency exists in the relation.
B) then A is said to be functionally dependent on B.
C) then B is said to be functionally dependent on A.
D) then A and B are candidate keys for the relation.
E) None of the above are True.