System Analysis and Design
Advantages of Relational Database Management systems are

Security controls can be more easily implemented.
None of these
Flexibility, of relating different logical files
All 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 Turnaround document

is output at one point which later comes back as an input
All of these
is circulated among all the heads of departments of an organization.
is circulated among all the staff of an organization.
None of these

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System Analysis and Design
Data Definition Language (DDL)

all of the listed here
describes how data are structured in the data base
specifies for the DBMS what is required; the techniques used to process data
determine how data must be structured to produce the user's view

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