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

All of these
None of these
to identify the top level functions by combining many smaller components into a single entity.
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

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

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