A field technician is upgrading an HPE ProLiant DL380 Gen10 server. The customer has purchased an HPE Smart Array P408i-a SR Gen10 controller to provide hardware RAID for a new set of SAS drives. The technician needs to physically install the controller in the server chassis. Based on the controller model name and the provided simplified system board layout, where must the technician install this specific controller? ```mermaid graph TD subgraph "ProLiant DL380 Gen10 System Board (Simplified)" CPU1[CPU Socket 1] CPU2[CPU Socket 2] DIMMs1[DIMM Slots] DIMMs2[DIMM Slots] PCIe1[PCIe Riser Slots] FlexibleLOM[FlexibleLOM Slot] AROC[AROC Connector] end CPU1 --- DIMMs1 CPU2 --- DIMMs2 PCIe1 --- AROC FlexibleLOM --- AROC ```