3. Consider the following relation R (A, B, C, D, E) with the functional dependencies, AB->C, CD->E& DE->B. Find the minimal key. 4.Consider the following relation Car_sale (CarNo, CarModel, SalesManld, SalesManName, DateOfSale, Commission, DiscountAmt) With functional dependencies, CarNo->(CarModel, SalesManld) SalesManld->(SalesManName, Commission) SalesManld, DateOfSale)->DiscountAmt Decompose this table into 3rd normal form