How can Conditional Access App Control in Microsoft Defender for Cloud Apps help prevent sensitive data exfiltration from unmanaged devices?

Conditional Access App Control in Microsoft Defender for Cloud Apps is designed to enhance security by enforcing policies on data access and usage, particularly focusing on devices that do not meet organization-defined compliance standards. The correct answer emphasizes the capability of the solution to block potentially harmful actions—specifically, the downloading, cutting, copying, and printing of sensitive documents on unmanaged devices.

This measure is crucial because unmanaged devices may lack the necessary security controls and configurations that compliant devices have. By preventing these operations, an organization can effectively mitigate the risk of sensitive data being exfiltrated or mishandled, as unmanaged devices pose a higher risk for data breaches due to inadequate security protections.

The other choices, while they present various security features, do not address the specific functionality of preventing data exfiltration in the same targeted manner as blocking certain actions. For example, simply sending downloads for scanning might still allow the user to access sensitive information temporarily, which could lead to unintended data exposure. Similarly, logging download attempts provides useful information for audits but does not proactively prevent data loss in real-time. Automatic encryption could secure data but does not specifically prevent the action of copying or printing sensitive documents, which is what the correct answer directly addresses.