A cluster using IPAT via IP aliasing has four adapters. Normally there are several resource  groups that have a total of four service IP labels. When two of the adapters fail， what happens？（）  

• A、 The resource group containing the IP labels changes to an "offline" state.
• B、 The IP service labels of the failed adapters relocate the surviving adapters.
• C、 Nothing because the resource groups wait for the adapters to become active again.
• D、 The resource groups containing the IP labels of the failed adapters migrate to a backup node.