Final answer:
The current version of the RadioRA2 design software is accessible through the RadioRA2 website for authorized users who have completed Lutron training.
Step-by-step explanation:
The current version of RadioRA2 design software can be accessed through the B) RadioRA2 website. Lutron's RadioRA2 is a wireless home automation system that allows users to control lighting, shades, temperature, and more. To obtain the software, authorized users must log into their Lutron account on the RadioRA2 website. The software is not available in the Lutron Connect app, at home improvement stores, or through authorized Lutron dealers as far as distribution of the software itself goes, though dealers may use it for setup services. To become an authorized user and gain access to the design software, one typically needs to complete Lutron training, which educates users on proper installation and programming of the system.