What organization is known for creating standardized modeling software protocols?

The correct choice identifies Building Smart International as the organization responsible for creating standardized modeling software protocols in the realm of Building Information Modeling (BIM). This organization is known for developing international standards and protocols that facilitate interoperability and efficiency in the construction and design industry. Building Smart International specifically works on the IFC (Industry Foundation Classes) standard, which promotes consistency and data exchange between different software systems used in the architecture, engineering, and construction sectors.

While the American Institute of Architects focuses on architectural practices and standards within the profession, and the Construction Specifications Institute is concerned primarily with construction documentation and specifications, neither deals directly with the development of standardized modeling software protocols. The National Institute of Building Sciences contributes to enhancing efficiency and innovation within the building industry but is not specifically focused on creating software standards in the same comprehensive manner as Building Smart International.