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

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

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System Analysis and Design
The advantage of Purchase Option is (are)

No financing is requird. The risk of system obsolescence is shifted to the lessor
the flexibility of modifying the system at will
Insurances, maintenance, and other expenses are included in the rental charge
All of these
None of these

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System Analysis and Design
Indexed-Sequential organization

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

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