System Analysis and Design
A couple:

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

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

the flexibility of modifying the system at will
None of these
All 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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