What action should an operator take to deploy three unique VM instances from a template?

The correct action for deploying three unique VM instances from a template involves utilizing a customization specification that can ensure each instance has its own unique configuration. By using a Windows 10 customization specification when deploying the virtual machines, the operator can automate the customization process for each VM. This includes settings like the computer name, network settings, and security configurations, ensuring that each virtual machine operates independently while maintaining a base configuration from the template.

Using a customization specification is a best practice in virtual machine deployment, particularly when scaling up the number of VMs. It simplifies the process significantly, as the operator does not have to manually configure each virtual machine after deployment. This saves time and reduces the risk of errors, leading to a more streamlined and efficient deployment process.

In contrast, options that involve cloning the template and then changing the computer name individually may lead to inconsistencies or inefficiencies. They could also require additional steps for each instance, increasing the possibility of human error and slowing down the deployment cycle. The automation and efficiency afforded by a customization specification make the first option the best choice for deploying multiple unique instances.