Consider the following recursive implementation of linear search: #include int recursive_search_num(int *arr, int num, int idx, int len) if(idx == len) return -1; if(arr[idx] == num) return idx; return __________; int main() int arr[5] =1,3,3,3,5,num=2,len = 5; int indx = recursive_search_num(arr,num,0,len); printf("Index of %d is %d",num,indx); return 0; Which of the following recursive calls should be added to complete the above code?

Answer: Option C