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

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

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System Analysis and Design
An open rectangle

identifies data flow
None of these
defines a source or destination of system data
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

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