Which three changes to a distributed switch configuration could trigger a rollback?

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 MTU.
E. Changing the VLAN settings in the distributed port group of the management VMkernel adapter.