The least secure method for sending an authentication code is OSMS text, as it is vulnerable to interception. Compared to other methods like authentication apps and MFA push notifications, SMS messages can be more easily compromised. Therefore, reliance on SMS for security is not recommended. ;
C. SMS text is the least secure method for sending an authentication code, as it can be intercepted through various attacks. In contrast, authentication apps and MFA push notifications offer greater security. Therefore, relying on SMS for authentication codes is not recommended.
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