The installation in the accompanying drawing is wired with EMT. Receptacle outlet B is o...

The installation in the accompanying drawing is wired with EMT. Receptacle outlet B is only a few feet from switch C. Receptacle outlet A is only a few feet from switch D. The electrician saved a considerable amount of wire by picking up the supply (feed) for switch C from receptacle B, and the switch leg (return) from switch D. What is wrong with this installation?

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