Characterize Group II buildings in terms of their enclosure and location:

Group II buildings are characterized as being totally enclosed and primarily located in northern areas. This enclosure offers protection against the harsher weather conditions typically found in these regions, such as cold temperatures, snow, and wind. The design of Group II buildings emphasizes insulation and protection from external elements, ensuring that the internal environment remains stable and suitable for various purposes, such as housing livestock or storing equipment. The northern location is significant as it aligns with the climatic considerations that necessitate such building types, focusing on creating a controlled environment.

The other options suggest different types of structures that do not accurately align with the defining characteristics of Group II buildings. For instance, being open structures in southern climates or temporary and portable buildings relates more closely to Group I or other classifications that prioritize flexibility and exposure to a milder climate rather than the robust, enclosed nature associated with Group II.