A company that provides cloud-based storage services allows user authentication using third- party social network credentials. Which of the following should be implemented to accomplish this task?

Multifactor authentication (MFA) enhances the security of user authentication, ensuring that even when users authenticate through third-party social network credentials, their identity is verified using multiple factors. This practice is crucial for protecting access to sensitive cloud-based storage services, providing robust defense against unauthorized access despite leveraging external identity providers.

A Virtual Private Network (VPN) creates a secure tunnel for network communication but does not directly enable user authentication using third-party social network credentials.

Federation is the underlying mechanism that allows authentication using third-party credentials by trusting external identity providers, but the question implies a security control that should be implemented for robust authentication.

Domain trusts are used to establish authentication relationships between different domains within an enterprise network, not for integrating with external social network identity providers.