What nazi action marked the final stage of the "final solution" ?

Hey There Jasmine, 

What nazi action marked the final stage of the "final solution"

Nazis built extermination camps equipped with huge gas chambers that could kill as many as 6000 human beings in a day. Those labeled as weak would die. They were told to undress for a shower and then led into a chamber with fake shower heads. After the doors were closed, cyanide gas poured from the shower heads. All inside were killed in a matter of minutes.

Dpolitical is the answer

Soory i don’t know hope you get a good grade