At which of the following times should the administrator refer to the HCL?

Referring to the HCL prior to purchasing hardware is crucial to ensure that all components-motherboards, processors, memory, storage devices, and peripherals-are officially supported by the intended operating system or software. This proactive check prevents compatibility issues, driver problems, and potential system instability, saving time and resources during deployment and operation.

While checking the HCL before installation is helpful, the most impactful time is before purchasing, as installation is too late to change incompatible hardware.

When installing drivers, an administrator might encounter issues if hardware isn't on the HCL, but consulting the list earlier would have prevented the purchase of unsupported hardware.

After installation, an HCL check is reactive; the goal is to prevent issues from arising in the first place by ensuring compatibility before acquisition.