Which formulation most accurately defines a measurement sensor?

Select one alternative:

measurement sensors transform the measured quantity into a discrete output signal i.e.

in a form of on/off signal (e.g. detection of object presence or detect object position, limit)

measurement sensors transform the measured quantity into a continues output electrical

signal (e.g. detection of object presence or detect object position, limit)

measurement sensors transform the measured quantity into a continues output electrical

signal (e.g. measurement of temperature, force, acceleration)

measurement sensors transform the measured quantity into a discrete output signal i.e.

in a form of on/off signal (e.g. measurement of temperature, force, acceleration)