Let R= (A, B, C, D, E, F) be a relation scheme with the following dependencies C->F, E->A, EC->D, A->B Which of the following is a key for R?
A. CD
B. EC
C. AE
D. AC
Answer:B
Let R= (A, B, C, D, E, F) be a relation scheme with the following dependencies C->F, E->A, EC->D, A->B Which of the following is a key for R?
A. CD B. EC C. AE D. AC