What adapter is used specifically to test and reprogram the GBU-39 and BRU-61?

The correct choice is the ADU-890 adapter, which is specifically designed for testing and reprogramming the GBU-39 Small Diameter Bomb (SDB) and the BRU-61 Intelligent Munitions Rack. This adapter provides the necessary interface and communication required to ensure these advanced munition systems function correctly in various operational scenarios.

The ADU-890 facilitates the updating of weapon software and the configuration of the munitions for various mission profiles. It ensures that the GBU-39 can be fully utilized with the required precision and functionality, showcasing the importance of having the right adapter for specific munitions to maintain operational effectiveness.

Other options, while they may have functionalities related to testing or working with munitions, do not specifically target the GBU-39 and BRU-61 as the ADU-890 does. Each adapter generally serves distinct purposes associated with other types of weapons or systems.