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

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

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Automation System
Today, programmable controllers:

None of these
are relatively low cost compared with the original digital equipment available for industrial control
can be cost effective even when replacing just a few relays
are more powerful then the first controllers on the market
All of these

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