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If i 3 bet do i fold to a 4 bet?

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I would like to comment on this hypothetical question. Since you have no read on the villain, taking any line of action that could result in you folding this hand on this board is being reckless with your bankroll IMO. 3 bet and fold to a 4 bet are lines you can only take against opponents you know very well. Whenever you are in a situation HU against an unknown with a decent hand such as the one you have, I would never take a line that would possibly lead to you folding. If you would feel compelled to fold to a 4 bet if you did 3 bet then you should not 3 bet to begin with. Against an unknown, getting to the showdown with this hand is too valuable IMO.

So you really only have 3 lines of action that are acceptable IMO:
1)call down
2) 3bet/call the turn and call/bet/check the river
3)call the turn, and raise/call, bet or check the river

I choose #1.