Which tanks are designated for storing drinkable water?

The correct choice is the one that explicitly refers to the storage of drinkable water. Potable water tanks are specifically designed for this purpose, ensuring that the water stored is safe for human consumption. These tanks are constructed using materials that do not contaminate the water, and they often adhere to health and safety regulations to maintain water quality.

In contrast, the other types of tanks serve different functions. VCHT (Vacuum Collection and Holding Tank) tanks are used for storing wastewater and are not suitable for drinkable water. Holding tanks typically serve as temporary storage for various non-potable liquids, while fuel oil tanks are dedicated to storing fuel, which is clearly not intended for consumption. Thus, the designation of potable water tanks is critical for ensuring access to safe drinking water and maintaining public health.