When performing subtraction by addition in the 2's-complement system:

[A].	the minuend and the subtrahend are both changed to the 2's-complement.
[B].	the minuend is changed to 2's-complement and the subtrahend is left in its original form.
[C].	the minuend is left in its original form and the subtrahend is changed to its 2's-complement.
[D].	the minuend and subtrahend are both left in their original form.

Answer: Option C

Explanation:

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