Automation System
Today, programmable controllers:

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

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

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

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