System Analysis and Design
Advantages of Relational Database Management systems are

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

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System Analysis and Design
The advantage of Purchase Option is (are)

No financing is requird. The risk of system obsolescence is shifted to the lessor
All of these
None of these
Insurances, maintenance, and other expenses are included in the rental charge
the flexibility of modifying the system at will

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