System Analysis and Design
A square symbols

identifies data flow
is a data store-data at rest, or a temporary repository of data
represents a process that transforms incoming data flow(s) into outgoing data flows
None of these
defines a source or destination of system data

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System Analysis and Design
The black-box concept:

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

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