What is the BEST recommendation to reduce the risk associated with potential system compromise when a vendor stops releasing security patches and updates for a business-critical legacy system?

Network segmentation, such as placing the system in a demilitarized zone (DMZ) or a dedicated VLAN, isolates the vulnerable legacy system, restricting its network access and limiting the potential impact and spread of a compromise to other systems. This minimizes the attack surface exposed to untrusted networks and devices, containing any potential breach.

Regular backups are crucial for recovery after a compromise but do not prevent the initial compromise or reduce the risk of exploitation for an unpatched system.

Virtualizing the system in the cloud merely changes its hosting environment; it does not inherently mitigate the risk of unpatched vulnerabilities, as the underlying operating system and application still remain vulnerable.

Antivirus software provides some protection, but it often relies on signatures for known threats and may not protect against new exploits targeting unpatched vulnerabilities in a legacy system.