What characterizes two-factor authentication?

• A. A method requiring single sign-on
• B. A security process involving one form of identification
• C. A security method with two forms of identification
• D. A process that prevents password sharing

Answer: (C)

Two-factor authentication is characterized by the use of two distinct forms of identification to verify a user's identity. This enhances security by requiring something the user knows (such as a password) and something the user has (such as a mobile device or a security token) or something the user is (like biometric data). By necessitating two different types of credentials, it adds an additional layer of security, making it more difficult for unauthorized users to gain access even if one form of identification is compromised.

This process significantly reduces the likelihood of unauthorized access compared to systems that rely on a single form of identification. Hence, the method strengthens overall security through this dual verification approach.