A company wants to ensure that all credentials for various systems are saved within a central
database so that users only have to login once for access to all systems. Which of the following
would accomplish this?

A.
Multi-factor authentication

B.
Smart card access

C.
Same Sign-On

D.
Single Sign-On

Explanation:
Single sign-on means that once a user (or other subject) is authenticated into a realm, reauthentication is not required for access to resources on any realm entity. Single sign-on is able to
internally translate and store credentials for the various mechanisms, from the credential used for
original authentication.