For Any Relation R,if,for Every Valid Instance of A,that Value

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