How does SAML enhance security in data exchange?

SAML (Security Assertion Markup Language) enhances security in data exchange primarily through the provision of a single sign-on (SSO) experience. This mechanism allows users to authenticate once and gain access to multiple applications and services without needing to log in repeatedly.

The SSO experience reduces the number of times a user has to enter their credentials, which in turn minimizes the opportunity for credential theft. With SAML, when a user logs into one service, an assertion is generated that confirms their identity and can be used to access other related services seamlessly. This improves security by centralizing authentication and potentially making user identity management more robust, as organizations can enforce stronger authentication mechanisms at the SSO entry point.

While other options touch upon important security aspects (like encryption and limiting access), the primary role of SAML in this context is to streamline the authentication process while enhancing security, which is why the correct answer highlights the single sign-on experience.