When attempting to secure a mobile workstation, which of the following authentication technologies rely on the user's physical characteristics? (Select TWO)

A MAC address table is used by network switches to map MAC addresses to ports for forwarding network traffic, not for authenticating a user based on their physical characteristics.

A retina scan is a biometric authentication method that identifies a user based on the unique pattern of blood vessels at the back of their eye, which is a distinct physical characteristic.

A fingerprint scan is a biometric authentication method that authenticates a user by analyzing the unique ridge and valley patterns on their finger, which are distinct physical characteristics.

Two-factor authentication is a security process requiring two distinct verification factors, but it is a method of authentication, not a specific technology that itself relies on a user's physical characteristics.

CAPTCHA is a challenge-response test designed to distinguish human users from automated bots, not to authenticate a user based on their physical characteristics.

A password string is a secret piece of information known by the user ('something you know'), not a physical characteristic.