Which action should an administrator perform in the vSphere Client to create a VM template that can be used by more than one vCenter Server instance?

Right-click the VM > Clone > Clone to Template creates a new template while preserving the original VM, but it does not inherently configure it for use by multiple vCenter Server instances without further steps like publishing to a content library.

Right-click the VM > Template > Convert to Template converts a virtual machine into a template object within the vCenter inventory. This action fundamentally creates the template, which can then be managed, for example, by adding it to a subscribed Content Library, thereby enabling its use across multiple vCenter Server instances.

Right-click the VM > Clone > Clone as Template to Library directly creates a template and places it into a Content Library, which is the mechanism for sharing, but 'Convert to Template' is a fundamental way to create a template that *can be* shared.

Right-click the VM template > Convert to Virtual Machine is the reverse operation, changing a template back into a runnable virtual machine, not creating a template.