System Analysis and Design
The term Parallel Run refers to

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

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System Analysis and Design
The black-box concept:

None of these
assumes that inputs and outputs will remain stable
All of these
is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
assumes that the black box is independent

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