Automation System
Programmable controllers:

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

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Automation System
The SKETCHPAD system

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

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