System Analysis and Design
Indexed-Sequential organization

means storing records in contiguous blocks according to a key
uses an index for each key type
stores records sequentially but uses an index to locate records
has records placed randomly throughout the file

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System Analysis and Design
An audit trial is

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

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