System Analysis and Design
The black-box concept:

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

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System Analysis and Design
A pseudocode is

a machine code
a computer generated random number
an easy way to communicate the logic of a program, in English¬like statements
a protocol used in data communication
None of these

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