Automation System
The "end-effector" of a robot:

All of these
can be an actual tool
may have a gripping action
is the robot "hand"
None of these

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

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

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