Its true that there is a rare chance that you may get a question with no right choices to pick, in which case you have to leave the question as it is. But from 4th Oct onwards the new exam
pattern may give you a hint as to how many questions are to be selected and if there is a chance if none are correct. Yet the new exam is like 10% more difficult and while only 35% passed in the old one I wonder what will be the updated percentage now!