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

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

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System Analysis and Design
An audit trial is

test data used by the system auditor
post-auditing the system after its implementation
All of these
designed to permit tracing of any input record or process performed on a system, back toits original sources
None of these

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