System Analysis and Design
A couple:

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

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System Analysis and Design
Indexed-Sequential organization

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

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