Given below are two premises (a) and (b). Four conclusions are drawn from them. Select the code that states validity drawn conclusion(s). [Taking the premises individually or jointly] 
Premises: 
(a) All judges are lawyers. 
(b) No doctors are lawyers. 
Conclusions: 
(i) No lawyers are doctors. 
(ii) No doctors are judges. 
(iii) All lawyers are judges. 
(iv) Some doctors are judges.