Then create a circuit called 1-bitAlu, to include 1-bitAdder, AND, OR and a multiplexer, and 2-bit Operation. It has three input a, b, carryIn, and two output c and carryout. It has 1-bit signal called BInvert which is used to invert b to feed into the second input of 1-bitAdder. It also has 2-bits control signal called Operation. See slide 28 in LogicalDesign1.pptx