What design feature helps to align the air shroud back into the motherboard tray?

In Supermicro systems, the air shroud aligns with the motherboard tray via tabs and slots. The correct feature is3 tabs on the front of the air shroud aligning with 3 slots on top of the fan board, a common design (e.g., SYS-420GP-TNAR) for precise placement over fans and CPUs. B (4 tabs) and C (2 tabs) deviate from standard counts, while D (PCIe board) misplaces the alignment. Supermicro’s DLC hybrid cooling ensures shroud accuracy, making A correct.References:Supermicro air shroud installation guides, DLC system cooling alignment.