Your ALU can add its two input registers, and it can logically complement the bits of either input register, but it cannot subtract. Numbers are to be stored in two's complement representation. List the micro-operations your control unit must perform to cause a subtraction. Consider the instruction: SUB R1, X, which subtracts the contents of location X from the contents of register R1, and places the result in R1. The first two steps are shown here. You must complete the rest.