Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

None of these
Verify the reputation of the people installing your system
do not leave training manuals unsecured
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not allow unbonded service people to work on your equipment

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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)
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
Pressure sensors:

use capacitive variations to sense pressure
use the piezoresistive effect in strain gauge sensors
None of these
use an aneroid chamber with a variable resistance output
All of these

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