Exercise 19.18 Consider a relation R with attributes ABCDE. Let the following FDs be given: A -. BC, BC E, and E- DA. Similarly, let Sbe a relation with attributes ABCDE and let the following FDs be given: A BC, B E, and E DA. (Only the second dependency differs from those that hold over R.) You do not know whether or which other (join) dependencies hold 1. Is R in BCNF? 2. Is R in 4NF? 3. Is R in 5NF? 4. Is S in BCNF? 5. Is S in 4NF? 6. Is S in 5NF? Need Explanations for the correct answer( Not just copy and pasted shortcut solutions from the intermet)