Answer:
The Nazi solution as the Allied forces approached a camp was often to liquidate the camp by killing prisoners and burning buildings. This was a common tactic used by the Nazis to cover up evidence of their crimes and atrocities. The Nazis did not typically free prisoners or offer them protection, but instead saw them as expendable and often killed them en masse to avoid the possibility of retribution or revenge. The other options listed were not typical Nazi solutions when facing the approach of Allied forces.