Question: Consider the following instance of a relation R(A, B, C, D): A B C D a1 b1 c1 d1 a1 b2 c1 d2 a2 b1

Consider the following instance of a relation R(A, B, C, D): 

A B C D 

a1 b1 c1 d1 

a1 b2 c1 d2 

a2 b1 c1 d1 

 Explain

A. Does this instance satisfy B → D? 

B. Does this instance satisfy BC → D? 

C. Does this instance satisfy C → D? 

D. Can the following be proven using Armstrong's Axioms? Explain your answer. If BC → D and B → D, then C → D

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