28. Which statement is correct? a. If an FD violates BCNF, then it violates 3NF. b. If an FD violates 3NF, then it violates BCNF. c. If a relation instance is in 3NF, then it is in BCNF d. If a key is in BCNF, then it is in 3NF. 29. If ABCD is an MVD for the relation R(A, B, C, D, E), then R also satisfies a. A->CD . AB->>C C. AB->CD. d. AB->>E 30. If AB->CD is an FD for the relation R(A, B, C, D, E), then R also satisfies a. A->CD. c. A->CD. d. AB->E 31. R(A, B, C, D, E) satisfies AB->>CD, A->B, and C->D. A 4NF decomposition of R is c. AC, BD, and AE d. ABCD and ABE. a. AB, CD, and ACE b. AB, CD, AC, and AE. 32. A trivial MVD in R(A, B, C, D) is c. A->CD d. AB->CD