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

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

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System Analysis and Design
Positive testing is

testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system
making sure that the new programs do in fact process certain transactions according to Specifications
running the system with line data by the actual user

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