Automation System
The robot:

None of these
will be more useful when robot vision is improved significantly
represents the most powerful new industrial automation tool currently on the horizon
is very primitive at the present
All of these

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Automation System
D/A (digital to analog) conversion:

None of these
has to be sampled at 1/2 the highest input frequency
must be fed through a filter to reproduce the original signal accurately
results in a binary code as the final output
both (b) and (c)

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Automation System
Today, programmable controllers:

None of these
are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market
All of these
can be cost effective even when replacing just a few relays

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