An administrator was notified that a resource group has failed over from the home node， Node1 to a standbynode， Node2 and that Node1 had been powered off. Upon restarting Node1 the administrator checked the AIXerror log and the cluster.log Which of the following is most likely the cause of the failover？（）
- AAIX was shut down
- BA fatal corruption occurred in the gsclvmd daemon
- CThe topsvcs daemon was stopped by the system resource controller
- DThe grpsvcs process was stopped by the system resource controller