Which of the following transducers can be used for non-contact temperature measurement?

Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor C) Sensistor D) Pyrometer 
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Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor C) Sensistor D) Pyrometer 

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