Which of the following solutions can help users who have the current Windows operating systems run legacy applications that are not supported under the latest applications?

AppLocker is a security feature that restricts which applications users can run, not a solution for running incompatible legacy applications.

Type 1 hypervisors are for running multiple operating systems directly on hardware; while they could host an older OS, application virtualization is a more direct and efficient solution for running just the application on a modern desktop OS.

A sandbox provides an isolated environment for running applications for security purposes, preventing them from affecting the host system, but its primary purpose is security, not necessarily direct compatibility for legacy applications.

Application virtualization encapsulates an application and its dependencies into a self-contained package that can run on a different operating system without full installation. This allows legacy applications, otherwise incompatible with newer Windows versions, to function by providing them with the environment they expect.