A system administrator has been monitoring cloud infrastructure usage over a period of time. The administrator notices that several hosts are consistently running close to capacity during work…

Mobility describes the capability to move workloads between hosts or locations, which is the mechanism used, not the reason the action was taken.

Utilization describes the metric being observed, but it is not the reason the migration was performed - it is the symptom that triggered the corrective action.

When hosts run close to capacity, the risk of resource starvation causes services to become unavailable or unresponsive. The administrator migrated VMs to distribute load and maintain continuous service availability by proactively preventing hosts from reaching the failure threshold. Availability - keeping services online and responsive - is the underlying reason that justifies the migration action.

Migration is the name of the action the administrator performed, not the reason or business justification for performing it.