Answer the following questions about normalization. (a) Define that a set X of attributes in a relation R is a candidate key, using arbitrary tuples t, t' ER. (b) Decompose a relation R(S, T, C, B, P) into relations which are in third normal form, where R has the following dependencies: . C is functionally dependent on SI, B is functionally dependent on {S, T}, and P is functionally dependent on B