What does a plumbing system include?

A plumbing system is a comprehensive network designed to handle both the distribution of water for various uses and the removal of wastewater. By defining the plumbing system to include water distribution pipes and drainage systems, it encompasses the complete functionality required for sanitation and convenience within any building or facility.

Water distribution pipes transport potable (drinking) water to fixtures such as sinks, toilets, and showers, which are essential for daily activities. On the other hand, the drainage systems are responsible for removing wastewater from these fixtures, ensuring that both the fresh water supply and the wastewater management are efficiently handled.

The other options are limited in scope, either referencing only a portion of the plumbing system or a specific type of plumbing. For instance, focusing solely on fixtures and faucets leaves out critical components like the pipes that carry water and waste. Similarly, stating that the plumbing system consists only of drainage pipes neglects the equally important water distribution aspect that is vital for a functioning plumbing network. Lastly, the mention of outdoor plumbing only excludes the extensive systems that are integral inside buildings. Thus, option B accurately represents the full definition and purpose of a plumbing system.