System Analysis and Design
The term Parallel Run refers to

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

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System Analysis and Design
System prototyping helps the designer in

all of the listed here
communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
making the programmers understand how the system will function.
giving a demo of the software, to the system manager to whom he reports

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