Consider the following Python code : def count (child_dict, i) : if i not in child_dict.keys() : return 1 ans = 1 for j in child_dict[i] : ans += count (child_dict, j) return ans child_dict = dict() child_dict [0] = [1, 2] child_dict [1] = [3, 4, 5] child_dict [2] = [6, 7, 8] print (count(child_dict,0)) Which ONE of the following is the output of this code ?