Answer:
Two-factor authentication.
Step-by-step explanation:
Multi-factor authentication is a security technique used to verify and authenticate users to an account, using more than one factor related to the user. It has to do with multiple factors like what the user knows, what the user have and who the user is. The respective example of these factors are using password or pin, security token and bio-metrics to access an account.
A two-factor authentication is a type of multi-factor authentication that uses two factors to authenticate a user, it could be using a PIN or password and a security token or bio-metrics.