Look at the following statements:
(a) For any relation schema, there is a dependency-preserving decomposition into 3NF(b) For any relation schema, there is not dependency-preserving decomposition into 3NF
(c) For any relation schema, there is dependency-preserving decomposition into BCNF
(d) For some relation schema, there is not dependency-preserving decomposition into BCNF
a. (a) and (d) are true
b. (a) and (b) are true
c. (a) and (c) are true
d. (b) and (d) are true
Answer: A