An administrator has an existing HMC and POWER6 570 connected to a network switch. The administrator is planning to install two POWER6 570s with a dedicated HMC. Which infrastructure is required for the new HMC?（）

• A、An additional switch for the new HMC
• B、Asynchronous adapters on the new HMC
• C、The two 570 servers are directly connected to the new HMC
• D、One 570 is directly connected to the new HMC and the other is directly connected to the existing HMC