Automation System
Light sensors:

come in a wide variety of mounting styles
cannot be used a s limit switches.
None of these
never use infrared light as light source
work in direct sunlight

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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
has to be sampled at 1/2 the highest input frequency
None of these
must be fed through a filter to reproduce the original signal accurately

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