PCI Use Case: If a platform has 3 PCI SCSI adapters from the same manufacturer, and the manufacturer requires the PCI SCSI adapter that has the highest version UEFI Driver to manage all 3 PCI SCSI adapters, then the Driver Family Override Protocol is required and it provides the version value used to make the selection. If the Driver Family Override Protocol is not produced, then the Bus Specific Driver Override Protocol for PCI selects the UEFI Driver from the PCI Option ROM to the adapter to manage each adapter.