System Analysis and Design
In Data structure, main characteristic of "ring" is :

first record points only to the last record
None of these
many records point to one record
last, record points to the first record
All of these

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System Analysis and Design
Acceptance testing is

testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate systems
running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications

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