Automation System
Historically, central systems were used because:

memory was very expensive
All of these
semiconductor memory was not available
memory consumed a large amount of power
None of these

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Automation System
The use of specialized workstations:

has a high cost-performance tradeoff
reduces the host computer workload
provides limited growth potentials for 3-D
reduces the host computer workload and allows more users
None of these

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