Automation System
A flip-flop:

is a combinational logic device
is a sequential logic device
(a) and (c)
None of these
remembers what was previously stored in it

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

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

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