System Analysis and Design
Advantages of Relational Database Management systems are

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

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System Analysis and Design
A square symbols

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

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