System Analysis and Design
To reconstruct a system, which of the following key element(s) must be considered :

all of the listed here
outputs and inputs
control and processors.
feedback and environment

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

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

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