?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 cost 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
Answer: C
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