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.
Security controls can be more easily implemented.
None of these
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
None of these
defines a source or destination of system data
is a data store-data at rest, or a temporary repository of data
identifies data flow

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