Which of the following statements are incorrect about the ansmission of Creutzfeldt-Jakob disease? O Iatrogenic transmission can occur through contaminated surgical instruments. O In the past, cases of CJD were transmitted through treatment with human growth hormone harvested from cadaver pituitary tissue. O Creutzfeldt-Jakob disease can be transmitted through respiratory droplets. O Creutzfeldt-Jakob disease is never inherited. O CJD can be acquired through a dura mater graft used to treat traumatic head injury.