A theft occurred, and after investigation, a total of two people committed the crime. The police arrested four suspects, A. B, C, and D. The criminal must be two of them. Upon inquiry, A said: "Ding is a criminal. " B said, "A is a criminal. " C said, "I am not a criminal. " Ding said, "I am not a criminal either. ". After investigation, two of the four said false words and two told the truth. Which of the following may be true? ['A. Ding committed a partnership.', 'C and D committing crimes in partnership.', 'A and C partner in crime.', 'A and B partner in crime.']