Automation System
Most continuous control actuators:

None of these
use a 4 to 20 mA current loop input
(b) and (c) above
are used with standard continuous control loop
are of the time proportioning type

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Automation System
Sensors:

are not important in automation
None of these
will be much smarter and more sophisticated in the future
probably will not improve over the next decade
are easily developed

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