Which security solution employs mandatory access control policies to run applications in sandboxes on Android devices?

The correct answer, which employs mandatory access control policies to run applications in sandboxes on Android devices, is SEAndroid. SEAndroid is an adaptation of SELinux specifically designed for the Android operating system. It implements mandatory access control to enhance security by ensuring that applications and services operate within defined boundaries and cannot access resources outside their permissions without explicit authorization.

This sandboxing approach is crucial in mobile environments like Android, where numerous apps with varying trust levels coexist. By defining strict rules about what each application can access, SEAndroid mitigates the risk of vulnerabilities being exploited, thus enhancing overall security.

While SELinux, the technology from which SEAndroid is derived, does apply mandatory access control, it is not specifically tailored for Android devices. AppArmor, another security framework, focuses on Linux but is not applicable to Android’s architecture. Tombstone refers to error reporting on Android devices rather than a security solution. Therefore, SEAndroid's targeted application for Android makes it the appropriate and correct choice for this question.