What action must an administrator perform in the vSphere Client to create a VM template usable by multiple vCenter Server instances?

To create a VM template that can be utilized across multiple vCenter Server instances, an administrator needs to use the functionality that involves the content library feature in vSphere. The correct action involves cloning a virtual machine to a library, specifically as a template.

When an administrator selects the option to "Clone as Template to Library," they are actually creating a new template within a content library, which can then be shared among different vCenter Server instances. This sharing capability is critical for environments that employ multiple vCenter Servers, enabling the administrator to maintain consistency and facilitate rapid provisioning of VMs across different datacenters.

This option is essential because content libraries serve as centralized repositories for VM templates, ISO images, and other files, ensuring that templates are accessible wherever they are needed without the need for separate cloning or distribution processes for each vCenter.

In contrast, the other options involve either converting a virtual machine to a template or cloning it without the specific intent of sharing it through a content library. This means they do not provide the capability to create a template that is inherently usable across multiple vCenter instances.