Which dishwashing machine is fully automatic?

A fully automatic dishwashing machine is designed to handle the entire dishwashing process without requiring manual intervention at any stage. The three-tank machine typically includes separate compartments for washing, rinsing, and sanitizing, and operates in a continuous cycle. This configuration allows dishes to move smoothly through each stage of cleaning automatically, making it the most efficient option for high-volume environments.

In contrast, single-tank and two-tank machines may require more manual loading and unloading or involve more steps that do not lend themselves to full automation. A manual dishwashing station, as the name implies, relies entirely on human effort to wash, rinse, and sanitize, making it the least automated of all options. Therefore, the three-tank machine is characterized by its automation and efficiency in handling the dishwashing process, making it the correct answer in this context.