System Analysis and Design
The feasibilities studied in preliminary investigation is (are):

operational feasibility
All of these
economic feasibility
technical feasibility
None of these

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

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.
All of these
None of these
to prepare flowcharts after programming has been completed

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