2. Design an adder/subtractor circuit using 7483 and the 7486. A control input, M, determines whether the circuit adds or subtracts two four-bit numbers using two's complement binary arithmetic. Function Table Adder/ Subtractor Control Input Operation A+B 1 A-B a. Derive the equations for the B inputs to the 7483 to operate as an adder/subtractor circuit b. Draw the schematic of the adder/subtractor circuit