The term CAPTCHA is $\_\_\_\_\_\_\_\_\_\_\_\_\_.$

Group of answer choices

a digital image used to help decipher a faded or blurry word in digitized news archives

a private combination of words associated with a user name that allows access to computer resources

a series of distorted characters that a user is required to enter correctly to continue using a website

the average time it takes a computer to discover a password based on the number of characters