Automation System
The SKETCHPAD system

All of these
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is used for interactive Graphics
is expensive because it is sophisticated and make demands on the power and resources of the computer.
None of these

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Automation System
Programmable controllers:

are widely used in many different industries
None of these
are programmed using relay ladder logic
(a) and (c) above
cannot perform functions other than relay logic

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