Which of the following best describes user authentication in Salesforce?

User authentication in Salesforce encompasses a wide range of methods designed to provide flexibility and security for users. The correct choice highlights that Salesforce supports various authentication methods, including Single Sign-On (SSO) as well as social login options, making it adaptable to different organizational needs.

Single Sign-On is a popular feature that simplifies the login process by allowing users to access multiple applications with one set of credentials. This not only enhances user experience but also improves security by reducing the number of passwords users need to manage. Additionally, social login options enable users to authenticate using their existing social media accounts, expanding the accessibility of the system for users who prefer this method.

This diverse range of options is crucial for meeting the varying needs of organizations and users while ensuring that authentication processes remain secure and efficient. Organizations can choose the method that best aligns with their security policies and user preferences, making Salesforce a versatile platform for user authentication.

The other choices do not capture the comprehensive nature of Salesforce's authentication capabilities. Limiting authentication to only social media logins, external identity providers, or solely two-factor authentication does not reflect the full range of options available within the platform.