System Analysis and Design
Advantages of Relational Database Management systems are

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

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System Analysis and Design
A square symbols

represents a process that transforms incoming data flow(s) into outgoing data flows
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

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