System Analysis and Design
Advantages of Relational Database Management systems are

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

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

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

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