Automation System
Programmable controllers:

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

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Automation System
Numerical control:

is a method for controlling the operation of a machine by means of a set of instructions
All of these
None of these
applies only to milling machines
is a method for producing an exact number of parts per hour

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