System Analysis and Design
A data flow diagram is

mainly used at the systems specification stage.
All of these
the modern version of flowchart
None of these
the primary output of the systems design phase

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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
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

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