While Swapping 2 No' What at Precautions to Be Taken

Multiple Choice

While swapping 2 no' what at precautions to be taken care? b = (b / a) ; a = a * b; b = a / b;

A) Data type should be either of short, int and long
B) Data type should be either of float and double
C) All data types are accepted except for (char *)
D) This code doesn't swap 2 numbers