A new p5 customer has just installed a partitioned p5-550 alongside some older POWER4 servers.  The pSeries technical specialist has received a call to say that the existing HMC （7315） cannot connect to the new server.  How can the specialist help the customer？（）

• A、Explain to the customer that they need an additional HMC for the POWER5 system.
• B、Obtain a PO from the customer to purchase additional serial connections to the HMC.
• C、Obtain a PO from the customer to purchase additional Ethernet connections to the HMC.
• D、Explain to the customer that they need a firmware update on the HMC to support both POWER4 and POWER5.