Company.com environment consists of 10 volume groups and 4 physical networks. The customer  Desires the fastest possible fallover for a two-node cluster.  Which of the following configuration alternatives will provide the fastest fallover？（）  

• A、 IPAT via IP Aliasing，default shared volume groups
• B、 IPAT via IP Replacement default shared volume groups
• C、 IPAT via IP Aliasing，enhanced concurrent volume groups
• D、 IPAT via IP Replacement，enhanced concurrent volume groups