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What are the disadvantages of optical scanners?

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Варианты ответа
Optical scanners are an exotic technology
Optical scanners don't use electrical current
Optical scanners are difficult to operate
Optical scanners can't always distinguish between a picture of a finger and the finger itself(Верный ответ)
Похожие вопросы
Like optical scanners, capacitive fingerprint scanners generate an image of the ridges and valleys that make up a fingerprint.
What type of sensor is used in optical fingerprint scanners?
How do capacitive fingerprint scanners differ from the optical ones?
The light sensor system used in optical scanners is the same as in digital cameras and camcorders.
What are the disadvantages of word processors?
Верно ли следующее утверждение:

Word processors do not have any disadvantages.

There is no way to make fingerprint scanners more reliable than they are now.
A CCD camera is usually used in capacitance fingerprint scanners.
What is in the heart of an optical scanner?
Up until recently computerized fingerprint scanners were a very common technology.