Which one of the following definition of the swap function would exchange the values of the variables i and j successfully? swap(&i, &j); /* exchange values of i and j */ a) void swap(int *x, int *y) { int tmp; tmp = *x; *x=*y; *y=*x; } b) void swap(int *x, int *y) { int tmp; tmp = *x; *x=*y; *y=tmp; } c) void swap(int *x, int *y) { int tmp; tmp = *x; *y=*x; *x=tmp; }