System Analysis and Design
Main characteristic of "ring", in Data structure, is

First record points only to the last record
Each record points to all other records
Last record points to the first record
Many records point to one record

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System Analysis and Design
An audit trial is

All of these
post-auditing the system after its implementation
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
None of these

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