2.The best tool that can be used in assessing schedule risks is
A.Gantt chart
B.network diagram
C.WBS
D.PERT chart

3.What best describes the goal of a project in its relationship with the customer,

from initial contact through delivery?
A.fitness for use
B.Customer satisfaction
C.Conformance to requirements
D.Fitness for purpose

4.Which of the following documents can minimize the time and cost necessary to

integrate changes into a project plan after project go-ahead?
A.Scope management plan
b.Scope baselime
C.Variance reports
D.Contract Requirements list

这是《PMP成功之路》最后的模拟题，给出的答案依次是DCAA,我的疑问：
1、改变项目结束时间还不会改变进度吗？C有什么关系
2、题目比较模糊，利用蒙特卡罗计数进行工期风险分析时不是用PDM作为模型吗？为什么不选B

？
3、项目最终成功不是要客户满意吗?我觉得这里选C。
4、题目是什么意思？