Nutanix documentation for Windows VM creation on AHV clearly states that when deploying the Nutanix VirtIO ISO for a VM using Secure Boot and UEFI, the SATA bus type must be used. Nutanix also documents that IDE is not supported when Secure Boot is enabled for UEFI mode, which reinforces the correct bus choice. This makes C. SATA the correct answer directly from the official procedure. ( Nutanix ) This is a compatibility question, not a performance question. It can be tempting to choose SCSI because it is common in virtual machine storage design, but Nutanix's secure-boot provisioning guidance is explicit about the VirtIO ISO attachment method. The exam often checks whether the administrator remembers that the driver ISO itself has a required bus type in secure-boot scenarios. Since the supported method in the Nutanix documentation is to mount the VirtIO ISO on SATA, C is the correct answer. ( Nutanix )