4. Consider the following set of functional dependencies on the relation schema R Find all candidate keys for R (A, B, C, D, E, F, G) A - BCDF a) B->D E->A DF -G b) Remove extraneous attributes and compute the canonical cover Provide detailed information of the process. c) Decompose the relation into a collection of schemas in 4NF using the canonical cover. Provide detailed information of the decomposition process