What does plumbing refer to in this context?

In the context of building design and construction, plumbing specifically refers to a system that encompasses the drainage system, venting system, and water supply system. This definition captures the essential elements of plumbing as it functions within structures to provide safe and effective management of water and waste.

The drainage system is responsible for directing wastewater away from buildings, while the venting system ensures that air can flow freely and prevents the buildup of pressure within the plumbing lines. The water system, on the other hand, is focused on the delivery of fresh water to faucets, showers, and other fixtures throughout a building. Together, these components work to maintain hygiene, comfort, and functionality within residential and commercial spaces.

Contrary to the other options, which do not accurately define plumbing as it is understood in the building and construction domain, the correct answer aligns with standard plumbing practices and regulations.