Automation System
Most industrial control applications:

None of these
can be solved using more than one method of control
All of these
can be done more reliably using solid-state methods
must have the process specified correctly to be successful

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Automation System
Programmable controllers:

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

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