At the end of a product development phase, an agile project team confirms that all tests have passed. The product is released, but the customer complains that it is deficient.
What should the project team have done prior to product release?
A . Requested approval from the project sponsor
B . Undertaken a review of all requirements
C . Conducted an end-of-phase demonstration
D . Performed a retrospective to validate project deliverables
Answer: D