System Analysis and Design
A couple:

means that the upper module has the capability of calling the lower module
is represented by a line joining two modules
None of these
is a data item that moves from one module to another
None of these

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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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