Automation System
The hardware device Jhat acts as both a switching and connecting unit is called a(n):

RS-232C port
communications processor
multiplexer
None of these
concentrator

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

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

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