System Analysis and Design
A square symbols

defines a source or destination of system data
None of these
identifies data flow
is a data store-data at rest, or a temporary repository of data
represents a process that transforms incoming data flow(s) into outgoing data flows

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System Analysis and Design
A couple:

is represented by a line joining two modules
None of these
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

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System Analysis and Design
Data Definition Language (DDL)

all of the listed here
specifies for the DBMS what is required; the techniques used to process data
describes how data are structured in the data base
determine how data must be structured to produce the user's view

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