Accelerated analysis approaches emphasize the construction of（ ）to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology，（ ）reads the program code and automatically generates the equivalent system model， and the code can be obtained from （请作答此空）. All system analysis approaches require some form of（ ）which includes those techniques to be used to identify or extract system problems and solution requirements from user community. （ ）is a classical set of techniques used to collect information about system problems， opportunities， solution requirements， and priorities.
Aexisting database and application program
Bapplication program and user interface
Cexisting database and user interface
Dexisting database，application program and user interface
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