What could have caused this?

The client produced a specification for a new product to be developed by Company A. Company A designed and successfully tested the new product against the test plan. yet the client does not agree that it meets the specification.

What could have caused this?

A. The requirements matrix did not adequately track back to client requirements.

B. The product was not adequately tested in accordance with the test plan.

C. Requirement changes were not properly identified in the project charier

D. The product design was not property reviewed by the quality department.

Answer: B