What does the following C function return?

int tadd_ok(int x, int y) {

int sum = x+y;

int neg = (x < 0) && (y < 0) && (sum >= 0);

int pos = (x >= 0) && (y >= 0) && (sum < 0);

return !neg && !pos;

}

	A.	The sum of the two arguments
	B.	Zero if the arguments are added without overflow
	C.	One if the arguments are added without overflow
	D.	The bitwise AND of the two arguments