As part of the quality audit, the scope statement is checked against the work results to ensure the conformance to the customer requirements. The results should be documented and used for （）.

A．estimating future projects

B．changing the project scope

C．defining future project tasks

D．validating the quality process

封面设计一般包括______、______、______等文字，以及体现书的内容、性质、题材的装饰形象、色彩和构图。