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

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

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Automation System
The program counter:

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

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