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

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

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System Analysis and Design
Unit testing is

running the system with line data by the actual user
None of these
is checking the logic of one or more programs in the candidate system
making sure that the new programs do in fact process certain transactions according to Specifications
testing changes made in an existing or a new program

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