Which of the header file should be added in the following C++ code to properly run the program? #include using namespace std; int print_all (int num, ...) int sum = 0; va_list args; va_start (args,num); for (int i = 0; i < num; i++) int num = va_arg (args,int); cout<<num<<" "; va_end (args); return sum; int main (void) print_all(8, 1, 2, -1, 4, 12, -2, 9, 7); return 0;

Answer: Option B