Which of the following authentication methods is the best way to prevent users from frequently...

Single sign-on (SSO)allows users to authenticate once and gain access to multiple systems without re-entering credentials, which significantly enhances user convenience while maintaining security.

FromQuentin Docter – CompTIA A+ Complete Study Guide:

“Single sign-on streamlines authentication by allowing users to log in once and access all authorized resources, reducing credential fatigue and improving security.”