Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
have a frequency measured in units of hertz
None of these
can have three possible levels

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Automation System
A flip-flop:

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

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