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

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

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Automation System
An encoder:

converts an input to a binary number
can have only four keys
converts a binary number to a decimal number.
None of these
is used to send telegraph signals

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