单项选择题

A.Populate the Power 750 first then add a GX+ adapter to support PCI-X andPCIe I/O drawer loops.
B.Populate the Power 750 first then add 2 GX+ adapters to support PCI-X andPCIe I/O drawer loops.
C.Populate the Power 750 first then add a GX++ adapter to support PCI-X andPCIe I/O drawer loops.
D.Populate the Power 750 first then add GX+ and GX++ adapters to support PCI-X andPCIe I/O drawer  loops.