A customer needs to add three JS22 blade servers. The customer currently has three HS21 Blade servers and one LS41 4-socket Blade Server. Based upon this information，  what additional items does the customer need to purchase？ （）

• A、An IBM BladeCenter H chassis for the JS22 Blade servers
• B、A concurrent KVM daughter card
• C、A pair of IBM BladeCenter Power Supplies
• D、A second Management Module