System Analysis and Design
In processing controls must be established in a system, in order to

prohibit tampering with information by unauthorized person
All of these
Verify that all data have been processed
None of these
block or trap faulty data from entry into processing

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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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