Which three changes to a distributed switch configuration could trigger a rollback? (Choose three.)

Which three changes to a distributed switch configuration could trigger a rollback? (Choose three.)
A . Blocking all ports in the distributed port group containing the management VMkernel network adapter.
B . Configure the virtual machine system traffic to enable bandwidth allocation using Network I/O Control.
C . Adding a new host with a previous vDS configuration.
D . Changing the MT
F . Changing the VLAN settings in the distributed port group of the management VMkernel adapter.

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Answer: ADE