How Is the "Final Solution" Best Described

How is the "Final Solution" best described?

A) It was a Nazi policy that envisioned the emigration of Jews to the island of Madagascar and elsewhere.
B) It was a plan for the "Thousand-Year Reich" enunciated by Hitler when he became chancellor of Germany in 1933.
C) It was the final phase of the holocaust, during which millions of Jews and others were murdered in purpose-built Nazi death camps.