正解:C
"An IR-pass filter blocks visible light and allows only infrared light to reach the camera sensor. This is commonly used for dedicated infrared imaging applications."
- Axis IR Filter Technologies
"An IR-cut filter, by contrast, blocks infrared light and lets visible light through."
- Axis Communications Academy, Network Video Fundamentals, 2022
References:
Axis IR Filter Technologies
Axis Communications Academy, Network Video Fundamentals, 2022 (p. 19)