Two-factor authentication typically combines something the user knows, such as a password, with something the user has or is, such as a one-time code or biometric. Even if one factor is compromised, an attacker still needs the second factor to log in. This layered verification greatly increases the difficulty of unauthorised access. Therefore, stronger account protection is the main benefit of 2FA.
Option A:
This option correctly states that 2FA relies on two independent types of evidence about identity. It reflects current best practices promoted by many educational, banking and social platforms.
Option B:
2FA does not remove the need for passwords; in most implementations, the password remains the first factor. Eliminating passwords altogether would change the model rather than strengthening it.
Option C:
Allowing anyone to access accounts without verification is the opposite of what 2FA achieves. 2FA is introduced precisely to tighten identity checks.
Option D:
Automatic global backup of data is a storage function, not an authentication feature. 2FA focuses on verifying who is trying to log in, not on copying information.
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