How do you know for sure that the change model is successful and there is no way for the staff to revert back to the "old way" of doing things?

Group of answer choices

After all the staff agree to adopt the "new way"

After you complete step $7$

After a full year on the "new way"

When all of the staff have been turned over and the newly hired staff only know the new way $-$ they never knew the old way