Insert a Clustered Column $-$ Line Combo chart in the worksheet based on ra

Consider the universal relation R = {(A, B, C, D, E, F, G, H, I, J} and the set of functional dependencies F = {ABC, A DE, B F, FGH, D IJ} a) (10) compute {B}* b) (10) True or False? Decomposition X= {R1, R2, R3, R4, R5} has the dependency preservation property, where R1 = (A, B, C), R2 = (A, D, E}, R3 = {B, F), R4= (F, G, H), R5= {D, I, J} c) (10) What is the key for R? Why? (Prove by computing its closure under F)