What must be enabled in the BIOS settings for virtualization to work on a computer?

For virtualization to function properly on a computer, virtualization support must be enabled in the BIOS settings. This feature, often referred to as Intel VT-x or AMD-V, allows the computer's processor to better manage and run virtual machines more efficiently. Without this support, the operating system will not be able to utilize the full capabilities of virtual environments, making it impossible to run hypervisors or virtual machines.

The other options do not directly relate to enabling virtualization. Enhanced security may improve the overall security posture of the system but won't specifically enable virtualization features. Secure Boot is focused on ensuring that only trusted software is loaded during the boot process, and legacy support pertains to compatibility with older hardware and software. Hence, they are not prerequisites for virtualization functionality.