System Analysis and Design
Advantages of Relational Database Management systems are

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

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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
identifies data flow
defines a source or destination of system data
None of these

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