I think the second option is the best one because to get the links from the different website with different ip give positive boost on the ranking and also improving the site strength as well.
All three are fine. Most people consider to go with second option. But make second as priority but first one is also nice.
second option is the better, as the different sites gives you link which is more effective then the ist one
No doubt you should go with second option because you get links from different IP which is according to google.