A.PCIe adapters are supported only in I/O drawers
B.PCI-X adapters are supported in both the CEC and in I/O drawers
C.PCI-X adapters are supported in the CEC; PCIe adapters are supported in 12X I/O drawers
D.PCIe adapters are supported in the CEC; PCI-X adapters are supported in 12X I/O drawers