Final answer:
Office buildings are predominantly categorized by their quality, which includes classes A, B, and C, with class A being the highest quality. Although aspects like size and use are relevant to an office building's function, they are not the primary method of categorization.
Step-by-step explanation:
Office buildings are commonly classified according to a variety of characteristics, which might include their size, location, facilities, age, and architectural design. However, a widely recognized method of categorization, especially within the real estate industry, is by their quality. Office buildings are typically categorized into three classes: Class A, Class B, and Class C, with Class A representing the highest quality buildings that have the best constructions, locations, and amenities; Class B indicating buildings that are generally good but not as high in quality as Class A; and Class C representing the least desirable buildings.
The depiction of two apartment buildings and the use of cubicles might hint at the question of use or size. However, it is the quality of an office building, rather than its size or specific use within the building, which is the primary categorization criterion. For instance, cubicles are a common feature inside office buildings to maximize individual workspace, which concerns interior design and efficiency but does not categorically differentiate buildings by quality.