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

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

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System Analysis and Design
The black-box concept:

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

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