Which of the following is NOT a basic type of roof vent?

The correct choice is based on the classification of roof vents. A gable vent typically refers to a special type of ventilation that is installed in the gable end of a house rather than being a direct roof vent. It is used primarily for attic ventilation and does not function as a roof vent in the traditional sense like a ridge vent, turbine vent, or roof vent.

Ridge vents run along the peak of the roof and allow rising heat and moisture to escape, while turbine vents are rotating vents that use wind power to draw hot air out of the attic. The term "roof vent" is a general classification that can include various types of vents designed to facilitate air circulation in roofing systems. Thus, the gable vent is distinct from these other types, which are more directly involved in roof ventilation.