What does a 'displacement-plowing-planing' hull refer to?

A 'displacement-plowing-planing' hull refers to a hull design that allows a vessel to operate efficiently at various speeds. This type of hull is engineered to handle different conditions in the water, offering versatility for both slower displacement modes, where the boat moves through the water by moving a volume of water, and planning modes, which occur at higher speeds where the vessel rises partly out of the water, reducing drag. This versatility is essential for different boating activities and allows the boat to perform well in diverse environments, making it suitable for both leisurely cruising and faster travel when needed.

In contrast, the other options suggest limitations in the hull's capabilities, such as being restricted to high speeds, shallow waters, or calm conditions, which does not accurately represent the capabilities of a displacement-plowing-planing hull. Such limitations would not provide the adaptability that this hull type is designed for.