Class A. Class B, Class C, and Class D together discuss the participation of class A in activity A. Class A said: All students in my class participated; Class B said: If Zhang Fan did not participate, then Li Hang did not participate; Class C: Li Hang participated; Ding said: None of my classmates participated. It is known that only one of the four people is incorrect, which shows that:. ['A is incorrect, Zhang Fan did not participate.', 'B is not correct, Zhang Fan participated.', 'C is incorrect, Zhang Fan did not participate.', 'Ding was incorrect, Zhang Fan participated.']