System Analysis and Design
Advantages of Relational Database Management systems are

All of these
None of these
Data independence since it allows the database to grow by adding new attributes and relations.
Flexibility, of relating different logical files
Security controls can be more easily implemented.

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System Analysis and Design
A square symbols

defines a source or destination of system data
None of these
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
identifies data flow

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