System Analysis and Design
The approach used in top-down analysis and and design is

All of these
to identify the top level functions by combining many smaller components into a single entity.
None of these
to identify a top level function and then create a hierarchy of lower level modules and components
to prepare flowcharts after programming has been completed

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System Analysis and Design
System prototyping helps the designer in

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

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