Which of the following is NOT part of the definition of 'plumbing' under the Building Code Act?

The correct answer indicates that a structural support system is not part of the definition of 'plumbing' under the Building Code Act. In the context of the Building Code, plumbing specifically refers to the systems involved in transporting water and waste within buildings. This includes the drainage system, the venting system, and the water supply system, all of which work together to ensure proper sanitation, waste management, and water accessibility.

A structural support system, on the other hand, relates to the building's framework, which supports the weight of the structure and its occupants. This falls under different codes and regulations that govern building safety and structural integrity, rather than plumbing definitions. Therefore, understanding that plumbing encompasses only those systems that manage water and waste helps clarify why a structural support system is excluded from this particular definition.