What I like about Harvard is _____ there's the old classical look-there are parks and traditional buildings. [ ]

A. why

B. where

C. that

D. how

网络系统的集成一般要经过需求分析、选择解决方案、网络策略、网络实现四个步骤，其中需求分析虽然还处在开始阶段，但它对整个集成系统是至关重要的，占据非常重要的地位，请阐述需求分析的意义。