A HACMP/XD://HAGeo cluster has been installed with four nodes， two nodes at each site. The cluster is protected from site isolation by the DBFS facility in HACMP/XD://HAGeo.  In the event of a site failure，what happens？（）  

• A、 The dominate site will always assume the non-dominate site has failed and continue processing.
• B、 The dominate site initiates a call to the non-dominate site to verify if any of the nodes are functional.
• C、 The non-dominate site initiates a call to the dominate site to verify if any of the nodes are functional.
• D、 The nodes are completely independent and can call each other if they detect a total failure of the ZGeo_Primary network.