What does the term "plumbing" entail in relation to buildings?

The term "plumbing" in the context of buildings encompasses all systems involved in water supply and waste management within a structure. This includes not only the installation of pipes and fixtures for potable water, such as sinks and toilets, but also the systems for draining wastewater and sewage. Plumbing systems are essential for ensuring that buildings can effectively manage water, whether it involves bringing fresh water in or disposing of wastewater safely and hygienically.

The correct understanding of plumbing aligns with the comprehensive definition provided in option B, which captures the full scope of what plumbing entails within building infrastructure. By encompassing both the supply of water and the disposal of waste, this perspective acknowledges the critical role plumbing systems play in public health and sanitation in residential, commercial, and industrial buildings.