Automation System
One advantage of a PC in industrial control is that it:

None of these
All of these
is unreliable because there are no moving parts
is very difficult for the inexperienced programmer to understand
has a reliable long life compared to relay logic

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

both (b) and (c)
results in a binary code as the final output
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

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