Which of the following best describes the sensors designed to project and detect a light beam across an area?

A. Smoke

B. Thermal

C. Air-aspirating

D. Photo electric








 

Suggested Answer: D



Reference:
https://en.wikipedia.org/wiki/Photoelectric_sensor


This question is in 712-50 EC-Council Certified CISO (CCISO) Exam
For getting EC-Council Certified CISO (CCISO) Certificate




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