The four 100-meter athletes A. B, C, and D raced a total of four times. Among them, A was faster than B three times, B was faster than C three times, and C than D was three times. Based on the above conditions, it can be inferred:. ['Ding ran at least twice at the end.', 'Ding ran at least three times at the end.', 'Ding ran all four times.', 'Ding may be three times faster than A.']