社会折现率是( )的判别标准。

A．财务内部收益率
B．财务净现值
C．项目经济内部收益率
D．经济效益值

Requirements management is the process of （）, analyzing, tracing, prioritizing and agreeing on requirements and then controlling changes and com municating to relevant stakeholders.

A.communicating

B.collecting

C.filing

D.documenting