The IT security team at a large company is implementing more robust authentication measures to safeguard sensitive data and systems. The team is exploring multifactor authentication $($MFA$)$ options to bolster security. The company deals with highly confidential information and requires a robust solution. The team has narrowed the choices and is evaluating which aligns BEST with their security needs. Which multi$-$factor authentication method utilizes unique physical characteristics of individuals to verify their identity?