Final answer:
The LEED Green Building Rating System is a voluntary, consensus-based, and market-driven system primarily funded through registration and certification fees.
Step-by-step explanation:
The LEED Green Building Rating System is a voluntary, consensus-based, and market-driven system.
It is voluntary because it is not mandatory for buildings to pursue LEED certification. It is consensus-based because it involves the collaboration of experts from various fields who develop the rating system's criteria and standards. It is market-driven because it responds to the growing demand for sustainable and environmentally-friendly buildings.
Therefore, the answer is D. Privately funded because LEED is primarily funded through registration and certification fees paid by project teams seeking LEED certification.