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

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

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System Analysis and Design
A couple:

is represented by a line joining two modules
None of these
means that the upper module has the capability of calling the lower module
is a data item that moves from one module to another
None of these

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