Using SMS for multifactor authentication provides an extra layer of security, confirming the user's identity through a one-time code sent to their mobile device. This method is effective because even if a password is compromised, unauthorized access can be prevented if the attacker does not have access to the SMS code.
The other options do not add this critical layer of security by verifying the user's identity in real-time.
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What is multifactor authentication (MFA)?
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How does SMS-based verification improve security over traditional passwords?
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What are some potential drawbacks of using SMS for verification?