A real estate investment firm wants to implement single sign-on (SSO) for its dozens o request using the eXtensible Markup Language (XML) standard. What solution does this vendor use for SSO? LSASS VPN SAML

The solution that the vendor would use for Single Sign-On (SSO) in this context is **SAML** (Security Assertion Markup Language). ### Explanation: 1. **SAML**: It is an XML-based standard used for exchanging authentication and authorization data between parties, particularly between an identity provider and a service provider. SAML is widely used for SSO implementations because it allows users to authenticate once and gain access to multiple applications without needing to log in again. 2. **LSASS** (Local Security Authority Subsystem Service): This is a process in Windows that is responsible for enforcing the security policy on the system. It handles authentication and manages user logins but is not specifically designed for SSO across multiple applications. 3. **VPN** (Virtual Private Network): This is a technology that creates a secure connection over the internet. While it can provide secure access to a network, it does not inherently provide SSO capabilities. In summary, for implementing SSO using XML standards, **SAML** is the appropriate choice.