Which log file will best help troubleshoot whether the shutdown command is being successfully executed on the target server?

The Oracle VM administrator is having issues shutting down a virtual machine. Which log file
will best help troubleshoot whether the shutdown command is being successfully executed
on the target server?

A.
/var/log/ovs-agent/ovs_performance.log

B.
/var/log/ovs-agent/ovs_operation.log

C.
/var/log/xen/xend.log

D.
/var/log/xen/xend-debug.log