The responsibility assignment matrix(RAM) ______ .

A．is used for development of the project budget

B．is developed at the activity level and used to closely link project roles and responsibilities to project network activities

C．is used to show the connections between work that needs to be done and project team member It can show responsibilities at various levels of detail

D．is used to identify accountabilities in individual performance appraisals

在一个企业网中，防火墙应该是（）的一部分，构建防火墙时首先要考虑其保护的范围。

A.安全技术

B.安全设置

C.局部安全策略

D.全局安全策略