1. Full adder and parallel adder. b. Use your full subtractor to design a 4-bit a. Design a 1-bit full adder which has 3 inputs parallel subtractor. You should have two 4- bit inputs and one 5-bit output. Show me the screenshot of your circuit with input val- ues 3 and 11 and 2 outputs; then, make it as an inte- grated circuit. b. Use your full adder to design a 4-bit ripple- carry adder. You should have two 4-bit in- puts and one 5-bit output. Show me the screenshot of your circuit with input values 11 and 9. 3. Design a calculator circuit which can perform ei- ther addition or subtraction on a 4-digit binary input and generate a 5-digit binary output. Your circuit should let the user decide if the operation should be addition or subtraction. Note: you can re-use your parallel adder and parallel subtractor circuits 2. Full subtractor and parallel subtractor a. Design a 1-bit full subtractor which has 3 in- puts and 2 outputs; then, make it as an inte- grated circuit. Show me a screenshot of the original circuit