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.
All of these
Flexibility, of relating different logical files

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System Analysis and Design
A square symbols

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

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