Automation System
Pressure sensors:

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

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Automation System
D/A (digital to analog) conversion:

None of these
results in a binary code as the final output
must be fed through a filter to reproduce the original signal accurately
both (b) and (c)
has to be sampled at 1/2 the highest input frequency

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Automation System
A flip-flop:

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

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