Correct Answer: Because iterations are typically short in duration and a working product is delivered at the end of each iteration, verification and validation must take place frequently to ensure product quality.
Explanation:Because each iteration typically produces a working product that is built and integrated and iterations are typically two to four weeks in length, there is frequent verification and validation to ensure product quality. Verification is the confirmation that a product performs as specified by a customer (e.g. as indicated by a user story) and validation is the confirmation that a product behaves as desired (i.e., meets the customer’s need). Sometimes a product may be built and integrated to specification - that is, it can be verified - but it does not meet the intent of the customer - that is, it cannot be validated. [Agile Software Development: The Cooperative Game – 2nd Edition. Alistair Cockburn.] [Product quality]