Q:Question:You are given attributes ABCD and functional dependencies B -> ACD and C -> D as constraints. Also consider a relational database design consisting of a single relation r over R = ABCD. (a) What are all the keys in ABCD? (b) Give example of a superkey in ABCD that is not a key. (c) Give example of a superkey in ABCD that is also a key. (d) Give example of a trivial functional dependency over ABCD. (e) Does the design help enforce the de