Automation System
The program counter:

decides which program to run
contains the address of the next instruction to be executed
None of these
is where arithmetic is done in a computer.
counts the number of instructions that have been executed

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Automation System
Today, programmable controllers:

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

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