A pSeries technical specialist is configuring the network adapters for an HACMP cluster.  The plan is to use a four-port Ethernet adapter with IPAT via IP aliasing for the two service IP labels.  Which of the following would be a critical concern with the proposed configuration？（）

• A、A four-port adapter is not supported.
• B、The four-port adapter is a single point of failure.
• C、There should be a spare port for each service IP label.
• D、The four-port adapter could be a potential performance bottleneck.