Which of the following circumstances may cause a DRS cluster to become invalid (Choose Two)?

A.
Virtual machines have been powered on from a vSphere Client connected directly to an ESXi
host.

B.
A migration on a VM is attempted while the VM is in the process of failing over.

C.
A reservation on a Parent Pool is reduced while a VM is in the process of failing over.

D.
An ESXi host in the cluster has been placed into Maintenance Mode.

Explanation:
The DRS becomes invalid if:

1. A cluster might become overcommitted if a host fails.
2. A cluster becomes invalid if vCenter Server is unavailable and you power on virtual machines using a vSphere Client connected directly to a host.
3. A cluster becomes invalid if the user reduces the reservation on a parent resource pool while a virtual machine is in the process of failing over.
4. If changes are made to hosts or virtual machines using a vSphere Client connected to a host while vCenter Server is unavailable, those changes take effect. When vCenter Server becomes available again, you might find that clusters have turned red or yellow because cluster requirements are no longer met.