Which statement about the ‘protect the level of quality’ target is CORRECT?

Which statement about the ‘protect the level of quality’ target is CORRECT?
A . It is achieved by ensuring that all features are delivered
B. It is unlikely to be achieved if incomplete user documentation is provided
C. It allows change at the detailed level to be handled dynamically
D. It avoids the use of extra people to improve progress during a timebox

Answer: A