The disadvantage of the four-model approach is that ____.

The disadvantage of the four-model approach is that ____.
A) it gives an unclear picture of the current system functions before any modifications or improvements are made
B) the requirements of a new information system always are different from the current information system
C) additional time and money are required to develop a logical and physical model of the current system
D) it does not take additional steps to avoid mistakes made earlier in systems development


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