Since Jahi is a security engineer for a u.s. department of defense contractor. The method that he is deploying is option A: Multifactor authentication
Multi-factor authentication's main goal is to lessen the possibility of account takeovers and increase security for users and their accounts. Since weak or stolen passwords account for more than 80% of cyberattacks, MFA can add the extra security layers required to safeguard users' data and their accounts.
Therefore Jahi is using a system that uses multi-factor authentication requires a user to login using a combination of two or more credentials to prove their identity. It is a tiered approach to data and application security.
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See options below
Multifactor authentication
Biometric authentication
Two-factor authentication