Guys, thanks for commenting. So we know cancellable flight works. but we do not know whether a full year rental contract is needed, or just a hotel booking for 2 weeks is needed?
is it possible to book a cancellable flight for application, once get 1 year visa, I can choose when to flight in with another flight? Also for the accommodation, if I apply for 1 year O-A, do I need a 1 year hotel booking? or 1 year private property rental contract?