【单选题】
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. <br /> 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.
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