Question: 2. (15 points) Consider a relation with schema R(A,B,C,D) and FD= { AB->C, C->D, D- >A), what are the keys of R? Hint: Consider the

2. (15 points) Consider a relation with schema R(A,B,C,D) and FD=

2. (15 points) Consider a relation with schema R(A,B,C,D) and FD= { AB->C, C->D, D- >A), what are the keys of R? Hint: Consider the 15 possible non-empty subsets of attributes. First check if a set of attributes X in R is a super key of R. If X-> R then X is superkey of R. Then X is a super key and no subset of X is a super key, then X is a key - a minimum super key

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4. Explain the strengths and weaknesses of each approach.

d. Describe any challenges in trying to communicate. If there were no challenges, explain why you think it was so easy.

3. Identify the methods used within each of the three approaches.