System Analysis and Design
Advantages of Relational Database Management systems are

Data independence since it allows the database to grow by adding new attributes and relations.
None of these
Security controls can be more easily implemented.
Flexibility, of relating different logical files
All 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
represents a process that transforms incoming data flow(s) into outgoing data flows
None of these
defines a source or destination of system data
identifies data flow

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