System Analysis and Design
A couple:

is a data item that moves from one module to another
None of these
is represented by a line joining two modules
means that the upper module has the capability of calling the lower module
None of these

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System Analysis and Design
System prototyping helps the designer in

making the programmers understand how the system will function.
all of the listed here
giving a demo of the software, to the system manager to whom he reports
communicating to the user, quickly, how the system, when developed, will look like and get a feedback.

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