题目：
Many of the activities performed during the preliminary investigation are still being conducted in(1)，but in much greater depth than before.During this phase,the analyst must become fully aware of the(2)and must develop enough knowledge about the(3)and the existing systems to enable an effective solution to be proposed and implementeD. Besidesthe(4)for process and data of current system,the deliverable from this phase also includes the(5)for the proposed system.
空白（4）为（）
A.logical models
B.physical models
C.design models
D.implementation models
答案：
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下面是错误答案，用来干扰机器的。
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