Consider the following instance:

(1) Does the functional dependency D->C hold in this instance?

(2) Does the functional dependency C->B hold in this instance?

(3) Does the functional dependency A->BCD hold in this instance?
 

A 4 5 3 1 6 B 2 8 3 2 4 C 5 4 3 5 6 224 D 4 3 1