A customer is upgrading from a 16-core POWER6 570 with two enclosures to a 16-core Power 770 with only one enclosure. There are 22 PCI-X adapters and 19 PCIe adapters spread across the current CECs and I/O drawers. How many and what kind of drawers are needed to connect these adapters?（）

• A、2 PCI-X drawers and 2 PCIe drawers
• B、3 PCI-X drawers and 4 PCIe drawers
• C、4 PCI-X drawers and 3 PCIe drawers
• D、4 PCI-X drawers and 2 PCIe drawers