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An OT security practitioner wants to implement two-factor authentication (2FA).

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An OT security practitioner wants to implement two-factor authentication (2FA). Which of the following is the least secure method to use for implementation?

A.

Out-of-band authentication (OOBA)

B.

2FA over Short Message Service (SMS)

C.

Authenticator Apps for smartphones

D.

Fast Identity Online (FIDO) Universal 2nd Factor (U2F) USB key

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