Which of the following is NOT one of the three general types of structures?

The correct answer is contemporary because it is not classified as one of the three general types of structures, which typically include primitive, vernacular, and grand structures.

Primitive structures refer to the most basic forms of construction that have been used throughout human history, often made with materials readily available in the environment. They represent a fundamental approach to shelter and building, focusing on functionality and the use of natural resources.

Vernacular structures are those built using local materials and traditional construction techniques, reflecting the culture and climate of a specific region. These structures often evolve over time and are typically representative of the heritage and identity of a community.

Grand structures, on the other hand, refer to monumental and often elaborate buildings designed to convey power, prestige, or importance. They are characterized by their scale and architectural features that reflect sophistication, such as palaces, cathedrals, and government buildings.

Contemporary structures generally describe more modern buildings that embody current architectural styles and technologies but do not fit into the three general categories outlined. Thus, contemporary is not one of the primary types of structures discussed in architectural classifications.