System Analysis and Design
A square symbols

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

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System Analysis and Design
A system analyst designs a new system by

None of these
adopting a developed system to the present environment
developing the system as a large, single unit
identifying sub systems and the interfaces between sub systems
propose alternatives to the current system

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