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
the flexibility of modifying the system at will
Insurances, maintenance, and other expenses are included in the rental charge
All of these
None of these

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System Analysis and Design
A couple:

means that the upper module has the capability of calling the lower module
None of these
is represented by a line joining two modules
is a data item that moves from one module to another
None of these

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