Automation System
The device that assembles groups of characters into complete messages prior to their entering the CPU is called:

an interpreter
a compiler
None of these
a communications processor
an editor

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

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

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