System Analysis and Design
To reconstruct a system, which of the following key element(s) must be considered :

feedback and environment
all of the listed here
control and processors.
outputs and inputs

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System Analysis and Design
A square symbols

identifies data flow
represents a process that transforms incoming data flow(s) into outgoing data flows
None of these
defines a source or destination of system data
is a data store-data at rest, or a temporary repository of data

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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
the flexibility of modifying the system at will
None of these
No financing is requird. The risk of system obsolescence is shifted to the lessor
All of these

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