Q:Question:3. Consider the relation scheme R3 = {A, B, C, D} and the set of functional dependencies for the relation R3 are F3 = {AB -> C, C -> D, D -> A}. a) List down the nontrivial FDs that can be inferred from the given FDs F3? b) Find all candidate keys of R3? c) Indicate how the above relation (R3) violates BCNF. d) Why some functional dependencies are called trivial functional dependencies?