System Analysis and Design
The term Parallel Run refers to

the concurrent operation of an existing system and a new system
None of these
the processing of two different jobs initiated from two terminals.
the same job run on two different computer to test their speeds
All of these

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

to identify the top level functions by combining many smaller components into a single entity
to prepare flow charts after programming has been completed
to identify a top level function an d then create a hierarchy of lower-level modules and components.
all of the listed here

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