[单项选择]Many of the activities performed during the preliminary investigation are still being conducted in ______, but in much greater depth than before. During this phase, the analyst must become fully aware of the ______ and must develop enough knowledge about the ______ and the existing systems to enable an effective solution to be proposed and implemented. Besides the______ for process and data of current system, the deliverable from this phase also includes the ______for the proposed system.
A. 10gical models
B. physical models
C. design models
D. implementation models

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