“人是能够制造和使用生产工具的动物”此句话所用的说明方法是()。

A.分类别

B.作比较

C.下定义

D.作诠释

During the execution phase of project，you realize that one of the product functionalities has been omitted in the project plan，which will not eventually satisfy the requirement，you should （）.

A．update the project schedule and budget

B．submit a change request to change control board and re-baseline

C．negotiate with the client for a new delivery date based on the revised schedule

D．informing management and take necessary measures for changes in budget and schedule