Question: For two's complement arithmetic, when do an overflow happen? I. Two positive numbers are added and the result is negative II. Two negative numbers are

For two's complement arithmetic, when do an overflow happen?

I. Two positive numbers are added and the result is negative

II. Two negative numbers are added and the result is positive

III. When the carry into the sign bit is equals to the carry out of the bit

IV. When the carry into the sign bit is different from the carry out of the bit

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