Which Salesforce product allows encryption of Protected Health Information (PHI) data at rest to enhance Health Cloud?

The option that allows for the encryption of Protected Health Information (PHI) data at rest, thereby enhancing the security features of Health Cloud, is Shield. Salesforce Shield provides additional security tools that help organizations comply with regulatory requirements by ensuring that sensitive information, such as PHI, is encrypted when stored in Salesforce.

This capability is crucial in healthcare settings where protecting patient data is paramount due to regulations like HIPAA. Shield also includes capabilities such as Event Monitoring, Field Audit Trail, and Platform Encryption, all of which contribute to a more secure environment for sensitive health data.

Health Cloud itself primarily focuses on managing patient relationships and health records but does not inherently possess the advanced encryption features that Shield provides. Other products like Service Cloud and Tableau CRM have distinct functionalities primarily aimed at customer service and analytics, respectively, without the specific compliance and encryption features related to health information. Therefore, Shield stands out as the correct choice for ensuring PHI is handled securely in context of Health Cloud operations.