System Analysis and Design
An audit trial is

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

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System Analysis and Design
System prototyping helps the designer in

communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
all of the listed here
making the programmers understand how the system will function.
giving a demo of the software, to the system manager to whom he reports

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