What were the Nazis' final Solution?

The Nazis referred to it as 'The Final Solution (to the Jewish Question)'. It was also referred to as Operation Reinhard.

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Operation Reinhard referred specifically to the plan to kill all Jews in Nazi-occupied Poland. The wider plan was called the Final Solution.
The Nazis referred to it as the Final Solution [of the Jewish Question]. Since about 1980 historians have generally called it the Holocaust.