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

None of these
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)
has to be sampled at 1/2 the highest input frequency

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Automation System
Sensors:

probably will not improve over the next decade
are easily developed
are not important in automation
None of these
will be much smarter and more sophisticated in the future

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