For the given relation abcd, the following functional dependency exists: BC depends on DC, and D²B does not satisfy Boyce-Codd Normal Form (BCNF). What can be concluded about the relation?
a) It is in 1NF but not in 2NF
b) It is in BCNF
c) It is in 2NF but not in 3NF
d) It is not in BCNF, and there is a partial dependency