Q3. Design combinational logic circuit that generates the 2's complement of a 4-bit input binary number. Do the following: first, draw a truth-table with 4 inputs: a, b, c, and d, and four outputs: w, x, y, and z. Second, fill in the standard input values and find the output number (wxyz) which represents the 2's complement of the input (abcd). Finally, find the logic equation for each output w.x,y, and z using K-maps. You don't need to draw the logic circuits for the outputs. (10 marks) 2's complement