1. No.
2. You can actually do both.
3. The basic idea is if you leave the United States for less than six months at one go usually you are okay, you are not questioned too closely, but more than six months they question you very closely because of certain technical reasons.
At one year outside you lose your green card automatically unless you have something like a re-entry permit. If on the other hand, you are a U.S citizen there is no requirement that you have to stay in the United States. You can stay anywhere in the world, never have to come back again and you would still be a U.S citizen.
Note: Where transcribed from audio/video, this is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.
First of all; I would like to thank the entire Team member who has worked in my case. Special Kudos goes to my case manager 'Aruna Marthi'; she did absolutely fabulous job to get me through this whole process. The time, and efforts you guys have given me the only reason of this case successful. Can you believe it, I got my whole process completed within 6 months and I-485 got approved in less than 2 months.
Thanks again for all of your efforts.
Regards:
BK