50. 已知關聯(relation) T(A, B, C, D, E, F)，其函數相依集(functional dependency set) F = {B → D, C → A, AD → F}，下列何者為 T 之無損分解(lossless decomposition)？ (A) T1(A, B, C, D), T2(A, D, E, F) (B) T1(A, B, C, F), T2(B, C, D, E) (C) T1(A, C, D, E), T2(B, C, E, F) (D) T1(A, D, E, F), T2(B, C, D, F)