Which ejector rack is installed on the smart rack assembly?

The BRU-46 is the ejector rack specifically designed for installation on the smart rack assembly. This type of ejector rack is notable for its capability to support a wide variety of munitions and is modular, allowing for adaptability in various operational configurations. The BRU-46 provides advanced features that enhance the overall mission effectiveness of aircraft, particularly in terms of weapon management and deployment efficiency.

In summary, the BRU-46 is the correct choice because it is directly associated with the smart rack assembly, whereas the other options refer to different types of ejector racks that do not have this specific installation capability. The BRU-57, BRU-52, and BRU-54 are designed for different applications and functionality that do not align with the smart rack system.