From application security perspective, why should a CAPTCHA be used in a web application?

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Editor">Editor Staff asked 2 years ago

From application security perspective, why should a CAPTCHA be used in a web application?
i) To check the color blindness of a user
ii) To check the validity of a user session
iii) To prevent scripted attacks 
iv) To provide biometric authentication

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Editor">Editor Staff answered 2 years ago

iii) To prevent scripted attacks

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