When you sign up for something like a free email account, you may be presented with a CAPTCHA, the most common form of which is an image of several distorted letters. CAPTCHA stands for
ACoverage Analysis and Planning Tool for Computers and Humans Apart
BCompletely Automated Public Turing test to tell Computers and Humans Apart ✓ Correct
CCompletely Applied Parallel Technologies for Communication and Hardware Apart
DComparable Additional Protected Turing test to tell Computers and Humans Apart
Correct answer: (B) Completely Automated Public Turing test to tell Computers and Humans Apart
Explanation
CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart.
It uses distorted letters or images that a person can read but automated programs struggle to decode.
The name draws on the Turing test, which probes whether a machine can pass as human.
The other expansions invent unrelated phrases about coverage, parallel technologies or protected tests.
Its aim is to block bots from mass sign-ups while letting genuine users through.
Newer versions analyse behaviour or a single checkbox instead of only distorted text.
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