Final answer:
CAPTCHA is the wavy hard-to-read letter and number sequence that you type to prove that you are human to a website. Option C is correct.
Step-by-step explanation:
CAPTCHA, denoted as option C, encompasses the utilization of intricate, visually challenging combinations of letters and numbers that users must decipher and input on a website to verify their human identity. This security measure is strategically designed to thwart automated bots from engaging in activities such as form submissions, purchases, or other potentially malicious or spam-related actions. The acronym CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart, underscoring its fundamental purpose.
Employed in diverse formats, CAPTCHAs can manifest as distorted text, images, or even audio challenges. However, the prevalent form involves users interpreting visually obscured text and accurately entering it into a designated box. This visual iteration serves as a common line of defense against automated scripts, ensuring that the entity interacting with the website is a human capable of deciphering and responding to the presented challenge.
In essence, CAPTCHAs act as gatekeepers, introducing a layer of human verification that impedes automated processes, enhancing the security and integrity of online interactions. The multifaceted nature of CAPTCHAs addresses the evolving landscape of cyber threats, consistently adapting to provide a reliable mechanism for distinguishing between human users and potentially malicious automated entities.