Automation System
One of the following is not considered a method of input control in a CAD system.

Programmable function box
Joystick
None of these
Plotter
Touch terminal

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

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

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