Hi can someone please help me to answer this question? The answer could be one or more than one. Anyone has any idea, of which one is/are the right answer(s)? This is a C programming class..

Which of the following are examples of head recursion? O int sum (int in, count) f if (count 0) return 0 int retval ln. retval suma (in sizeof (int) co 1) return ret val; int sum (int in, count) f if (count 0) return 0 sum (in sizeof (int) 1) return Count ln. O int suma (int* in, count) f if (count 0 return *in sum (in sizeof (int) count 1) O int sum (int in, count) f if (count 0) return 0 int retval sum (in sizeof (int) Count 1) retval ln. return ret val