Automation System
The real "brain" of an artificial intelligence system is referred to as:

the expert system
recursive technology
bubble memory
natural language interfaces
None of these

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

both (b) and (c)
None of these
results in a binary code as the final output
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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