Answer Happy

please help me Sir, with this question, It's urgent. just write please whic one is correct. thanks
Single Choice (5.04) 4.When two integers represented by radix-complement are added, the rule of judging whether they overflow is A When two integers with the same sign are added, if the sign bit of the result is opposite to the sign bit of the adder, the overflow must occur B B When two integers are added, if the sign bit of the result is 0, there must be overflow
с When two integers are added, if the highest bit (sign bit) has carry, overflow must occur D When two integers are added, if the sign bit of the result is 1, there must be overflow