4. (5points)There is three-variable function f(x1,x2,x3)=m(0,1,2,3,7) Find the minimum-cost sum-of-products implementations of the functions. 5. (10points)Perform the following operations involving eight-bit 2 , s complement numbers.And verify whether the result is corret. A=87B=56,Gettheresultof(A+B)2,(AB)2s