An employee uses a password to log in to a company computer. Which of the following authentication methods did the employee use to gain access to the network?

Single-factor authentication (SFA) requires only one form of verification, such as a password, to confirm a user's identity. In this scenario, since only a password is used, it falls under SFA.

Single sign-on (SSO) is an authentication scheme that allows a user to log in with a single ID and password to gain access to multiple related but independent software systems, but it doesn't specify the number of factors used for the initial login.

Permissions define what an authenticated user can do with resources after access has been granted, not the method used to verify the user's identity during login.

Multifactor authentication (MFA) requires two or more distinct factors (e.g., something you know, something you have, something you are) to verify identity, which is not the case when only a password is used.