Which two circumstances might cause a DRS cluster to become invalid? (Choose two.)
A.
A reservation on a parent pool is reduced while a virtual machine is failing over.
B.
An ESXi host in the cluster has been placed into maintenance mode.
C.
A migration on a virtual machine is attempted while the virtual machine is failing over.
D.
Virtual machines have been powered on from a vSphere Client connected directly to an ESXi host.