Which of the following is an extension of a waste stack meant to provide venting?

A stack vent is specifically designed as an extension of a waste stack that functions to provide venting for the plumbing system. It allows air to enter the drainage system, which helps to maintain the proper flow of waste and prevent the formation of negative pressure within the pipes. This is crucial for the efficient operation of sinks, toilets, and other plumbing fixtures, as it aids in the smooth passage of waste and prevents the potential for siphoning water out of traps, which could lead to unpleasant odors and sewer gases entering the living spaces.

The design and purpose of a stack vent are carefully aligned with plumbing codes, ensuring that it adequately fulfills its role in maintaining the balance between air pressure and the flow of waste. In contrast, options such as drain pipes and seepage pipes do not serve the dual purpose of venting waste stacks and are instead focused on the transportation of waste water or drainage. A vent stack, while similar to a stack vent, typically serves a different function or configuration within the plumbing system, which is why the stack vent is the most suitable answer in this context.