As long as the diagnosis is accurate and the treatment is timely, the patient will not die. Now the patient is unfortunately dead. If the above assertion is true, the following must also be true? ['The diagnosis of this patient is not accurate, but the treatment is timely.', 'The diagnosis of this patient is accurate, but the treatment is not timely.', "If the cause of this patient's death is an inaccurate diagnosis, then the delay in treatment will not be the cause.", 'If the diagnosis of this patient is accurate, then the cause of death must be delayed treatment.']