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What is the MOST effective method to enhance security of a single sign-on (SSO) solution that interfaces with critical systems?
Correct Answer: A
Two-factor authentication (2FA) adds an additional layer of security to the authentication process by requiring users to provide two forms of identification: something they know (e.g., a password) and something they have (e.g., a physical token or a mobile device). This approach significantly reduces the risk of unauthorized access even if the user's password is compromised.