System Analysis and Design
The black-box concept:

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

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System Analysis and Design
The term Parallel Run refers to

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

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