A relation R(A,B,C) has the multi-valued dependency A→→B. If R is decomposed into R1(A,B) and R2(A,C) to satisfy 4NF, this decomposition is:
- ALossy and not dependency-preserving
- BA lossless-join decomposition
- CNot a valid decomposition
- DOnly valid if A is not a candidate key
Correct answer: B