System Analysis and Design
The approach used in top-down analysis and design is

all of the listed here
to identify a top level function an d then create a hierarchy of lower-level modules and components.
to identify the top level functions by combining many smaller components into a single entity
to prepare flow charts after programming has been completed

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

Insurances, maintenance, and other expenses are included in the rental charge
None of these
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

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