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

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

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System Analysis and Design
The black-box concept:

assumes that the black box is independent
is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
None of these
All of these
assumes that inputs and outputs will remain stable

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