System Analysis and Design
The four icons used in building Data Flow Diagram are

Flow, Source, Store, Process
None of these
Source, Process, Destination, Store
Flow, Process, Source/Destination, Store
Flow, Process, Source, Store

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System Analysis and Design
An open rectangle

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

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