Design 5: Build a 4 bit Adder/Subtractor and test out your circuit for the below operations and compare the outputs with the outputs for your Design 3 and 4. a) 0010 + 1001 b) 1000+0110 c) 0110 + 0101 d) 0001 + 0111 e) 1001 - 0010 1) 1000 - 0110 g) 0110 - 0101 h) 1001 - 0111