System Analysis and Design
Advantages of Relational Database Management systems are

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

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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
identifies data flow
defines a source or destination of system data

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