According to the Definition of Done, which activity must be completed for each sprint? Please choose the correct answer.

According to the Definition of Done, which activity must be completed for each sprint? Please choose the correct answer.
A . End user training must be delivered
B . Solution must be built and configured in the development system (DEV)
C . Functionality must be tested in the Quality system (QAS)
D . Functionality must be released to the business

Answer: B