System Analysis and Design
Back-up procedure helps in

none of the listed here
restoring the operation whenever there is a disk failure
restoring the data files whenever there is a system crash
all of the listed here

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

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

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