A management control point can be placed at selected management points (specific components at selected levels)of the WBS above. the work package level. These control points can be ______ .

A) used for rolling wave planning
B) decomposed further to help in creation of work authorization system
C) used for planning known work content that does not have detailed schedule activities
D) used as a basis for planning when associated work packages have not yet been planned

网络中常见的攻击类型描述不正确的是（）

A.网络攻击可分为拒绝服务型攻击.扫描窥探攻击和畸形报文攻击三大类

B.拒绝服务攻击和其他类型的攻击不同之处在于.攻击者并不是去寻找进入内部网络的入口，而是阻止合法用户访问资源或路由器

C.扫描窥探就能大致了解目标系统提供的服务种类和潜在的安全漏洞

D.畸形报文攻击是通过向目标系统发送有缺陷的ip报文，使得目标系统在处理这样的ip包时会出现崩溃

E.Ping of Death.Teardrop等是典型的拒绝服务型的攻击