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

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

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Automation System
An operating system:

All of these
can help reduce software development time
None of these
provides ability for other programmers to understand the software structure
is useless in most control applications

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