When considering migrating a POWER6 server with PCI-X and PCIe adapters to a Power 720, which statement is true?（）

• 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