In which scenario is VMware virtual machine virtual-based backup unsupported in Backup Exec?

In which scenario is VMware virtual machine virtual-based backup unsupported in Backup Exec?
A . if the virtual machine is powered off
B . if the virtual machine has a Linux operating system
C . if the virtual machine has a Physical Raw Disk Mapping (RDM) device
D . if the virtual machine has a 2TB disk configured

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Answer: C