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

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

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Automation System
Digital signals:

None of these
have a sinusoidal shape.
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level
can have three possible levels

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Automation System
Vision sensors:

can not improve much in the next decade
All of these
will more closely match the capabilities of the human eye
None of these
will remain very costly

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