In a fixed-point binary operator, the subtraction operation is generally implemented by what

In a fixed-point binary operator, the subtraction operation is generally implemented by what

Which of the following options is it?
A binary subtraction device for the operation of a primitive code
The binary subtraction of the B-complement operation
Decimal adder for the operation of C original code
The binary adder of the D-complement operation

To illustrate:
Subtraction 5-3 equals addition 5+ (-3)
The binary code of the Addend 5 is 0000 0101

Addend-3 binary code is 1000 0011
-3 of binary anti-code is 1111 1100
-3 of the twos complement is 1111 1101

That is 5-3 equivalent to 5+ (-3) =0000 0101+1111 1101=0000 0010=2
Where the highest level is 0, the positive number is 1 for negative numbers, the complement of positive numbers is itself, and the complement of negative numbers is taken back plus 1

This shows the subtraction of the binary adder equivalent to the complement operation.

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In a fixed-point binary operator, the subtraction operation is generally implemented by what