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

Category: QuestionsFrom application security perspective, why should a CAPTCHA be used in a web application?
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

1 Answers
Editor">Editor Staff answered 2 years ago

iii) To prevent scripted attacks