An important patch for a critical application has just been released, and a systems administrator is identifying all of the systems requiring the patch. Which of the following must be maintained in order to ensure that all systems requiring the patch are updated?

An asset inventory is crucial because it provides a comprehensive, up-to-date list of all hardware and software within an organization. This allows administrators to accurately identify every system running the critical application and ensure none are missed during patching. Without a complete inventory, systems could remain unpatched, leaving vulnerabilities open. Network enumeration is a discovery technique, not a persistent record of assets. Data certification relates to data quality and integrity, not system identification. A procurement process outlines how assets are acquired, but doesn't maintain an active list of what's currently deployed and needs patching.